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P87LPC779 Datasheet(PDF) 74 Page - NXP Semiconductors

Part # P87LPC779
Description  CMOS single-chip 8-bit 80C51 microcontroller with 128-byte data RAM, 8 kB OTP
PDF  74 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

P87LPC779 Datasheet(HTML) 74 Page - NXP Semiconductors

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© Koninklijke Philips Electronics N.V. 2004.
Printed in the U.S.A.
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner.
The information presented in this document does not form part of any quotation or
contract, is believed to be accurate and reliable and may be changed without notice. No
liability will be accepted by the publisher for any consequence of its use. Publication
thereof does not convey nor imply any license under patent- or other industrial or
intellectual property rights.
Date of release: 03 May 2004
Document order number: 9397 750 13213
Contents
Philips Semiconductors
P87LPC779
CMOS single-chip 8-bit microcontroller
1
General description . . . . . . . . . . . . . . . . . . . . . . 1
2
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
4
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5
Pinning information . . . . . . . . . . . . . . . . . . . . . . 5
5.1
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
6
Logic symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7
Special function registers . . . . . . . . . . . . . . . . . 8
8
Functional description . . . . . . . . . . . . . . . . . . 12
8.1
Enhanced CPU . . . . . . . . . . . . . . . . . . . . . . . . 12
8.2
Analog functions . . . . . . . . . . . . . . . . . . . . . . . 12
8.3
Analog to digital converter . . . . . . . . . . . . . . . 12
8.4
A/D timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8.4.1
The A/D in Power-down and Idle modes . . . . 15
8.4.2
Code examples for the A/D. . . . . . . . . . . . . . . 16
8.5
Digital to Analog Converter (DAC) outputs . . . 17
8.6
Analog comparators . . . . . . . . . . . . . . . . . . . . 17
8.6.1
Comparator configuration . . . . . . . . . . . . . . . . 18
8.6.2
Internal reference voltage . . . . . . . . . . . . . . . . 19
8.6.3
Comparator interrupt. . . . . . . . . . . . . . . . . . . . 20
8.6.4
Comparators and power reduction modes . . . 20
8.6.5
Comparator configuration example. . . . . . . . . 20
8.7
I2C-bus serial interface . . . . . . . . . . . . . . . . . . 20
8.7.1
I2C-bus interrupts . . . . . . . . . . . . . . . . . . . . . . 22
8.7.2
Reading I2CON . . . . . . . . . . . . . . . . . . . . . . . 23
8.7.3
Checking ATN and DRDY . . . . . . . . . . . . . . . . 23
8.7.4
Writing I2CON . . . . . . . . . . . . . . . . . . . . . . . . 24
8.7.5
Regarding Transmit Active . . . . . . . . . . . . . . . 24
8.7.6
Regarding software response time . . . . . . . . . 25
8.8
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8.8.1
External interrupt inputs . . . . . . . . . . . . . . . . . 28
8.9
I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.9.1
Quasi-bidirectional output configuration . . . . . 29
8.9.2
Open drain output configuration . . . . . . . . . . . 30
8.9.3
Push-pull output configuration . . . . . . . . . . . . 31
8.9.4
Keyboard interrupt (KBI) . . . . . . . . . . . . . . . . . 33
8.10
Oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.10.1
Low speed oscillator option . . . . . . . . . . . . . . 34
8.10.2
Medium speed oscillator option . . . . . . . . . . . 34
8.10.3
High speed oscillator option. . . . . . . . . . . . . . 34
8.10.4
On-chip RC oscillator option . . . . . . . . . . . . . . 35
8.10.5
External clock input option . . . . . . . . . . . . . . . 35
8.10.6
Clock output . . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.10.7
CPU clock modification: CLKR and DIVM . . . 36
8.11
Power monitoring functions. . . . . . . . . . . . . . . 37
8.11.1
Brownout detection . . . . . . . . . . . . . . . . . . . . . 37
8.11.2
Power-on detection . . . . . . . . . . . . . . . . . . . . . 38
8.12
Power reduction modes . . . . . . . . . . . . . . . . . 38
8.12.1
Idle mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.12.2
Power-down mode . . . . . . . . . . . . . . . . . . . . . 38
8.12.3
Low voltage EPROM operation . . . . . . . . . . . 39
8.13
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.14
Timer/counters . . . . . . . . . . . . . . . . . . . . . . . . 41
8.14.1
Mode 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8.14.2
Mode 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.14.3
Mode 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.14.4
Mode 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.14.5
Timer overflow toggle output . . . . . . . . . . . . . 45
8.15
UART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
8.15.1
Mode 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.15.2
Mode 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.15.3
Mode 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.15.4
Mode 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
8.15.5
Serial port control register (SCON) . . . . . . . . 46
8.15.6
Baud rates . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
8.15.7
Using Timer1 to generate baud rates. . . . . . . 48
8.15.8
More about UART Mode 0 . . . . . . . . . . . . . . . 49
8.15.9
More about UART Mode 1 . . . . . . . . . . . . . . . 50
8.15.10
More about UART Modes 2 and 3 . . . . . . . . . 51
8.15.11
Multiprocessor communications . . . . . . . . . . . 52
8.15.12
Automatic address recognition . . . . . . . . . . . . 52
8.16
Watchdog timer . . . . . . . . . . . . . . . . . . . . . . . 58
8.16.1
Watchdog feed sequence. . . . . . . . . . . . . . . . 59
8.16.2
Watchdog reset . . . . . . . . . . . . . . . . . . . . . . . 59
8.17
Additional features . . . . . . . . . . . . . . . . . . . . . 60
8.17.1
Software reset . . . . . . . . . . . . . . . . . . . . . . . . 61
8.17.2
Dual data pointers . . . . . . . . . . . . . . . . . . . . . 61
8.18
EPROM characteristics . . . . . . . . . . . . . . . . . 61
8.18.1
System configuration bytes . . . . . . . . . . . . . . 62
8.18.2
Security bits . . . . . . . . . . . . . . . . . . . . . . . . . . 63
9
Limiting values . . . . . . . . . . . . . . . . . . . . . . . . 64
10
Static characteristics . . . . . . . . . . . . . . . . . . . 65
11
Dynamic characteristics . . . . . . . . . . . . . . . . . 69
12
Comparator electrical characteristics . . . . . . 70
13
D/A electrical characteristics . . . . . . . . . . . . . 70
14
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 71
15
Revision history . . . . . . . . . . . . . . . . . . . . . . . 72
16
Data sheet status. . . . . . . . . . . . . . . . . . . . . . . 73
17
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
18
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
19
Licenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73



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