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P87LPC778FDH Datasheet(PDF) 21 Page - NXP Semiconductors

Part # P87LPC778FDH
Description  CMOS single-chip 8-bit 80C51 microcontroller 128-byte data RAM, 8 kB OTP
PDF  79 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

P87LPC778FDH Datasheet(HTML) 21 Page - NXP Semiconductors

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Philips Semiconductors
P87LPC778
CMOS single-chip 8-bit microcontroller
Product data
Rev. 01 — 31 March 2004
21 of 79
9397 750 12378
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
When the counter reaches underflow it is reloaded with a user selectable value. This
mechanism allows the user to set the PWM frequency at any integer sub-multiple of
the microcontroller clock frequency. The repetition frequency of the PWM is given by:
(4)
Where CNSW is contained in SFRs CNSW0 and CNSW1 as a 10-bit value,
described in the following tables.
The word ‘Shadow’ refers to the fact that writes are not into the register that controls
the counter; rather they are into a holding register.
As described below the transfer of data from this holding register, into the register
which contains the actual reload value, is controlled by the user’s program, by setting
the XFER bit and waiting till the next underflow of the counter.
Table 11:
CNSW0 - Counter shadow register 0 (address 0D1H) bit allocation
Reset value: FFH
Bit
7
6
5
4
3
2
1
0
Symbol
CNSW7
CNSW6 CNSW5 CNSW4
CNSW3
CNSW2 CNSW1 CNSW0
Table 12:
CNSW1 - Counter shadow register 1 (address 0D2H) bit allocation
Reset value: FFH
Bit
7
6
5
4
3
2
1
0
Symbol
Unused
Unused
Unused
Unused
Unused
Unused
CNSW9 CNSW8
f
PWM
f
CPWM
CNSW
1
+
()
-------------------------------
=



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