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AT89C51ED2-RDTIM Datasheet(PDF) 15 Page - ATMEL Corporation

Part # AT89C51ED2-RDTIM
Description  8-bit Flash Microcontroller
PDF  137 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM Datasheet(HTML) 15 Page - ATMEL Corporation

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15
AT89C51RD2/ED2
4235E–8051–04/04
Oscillator
To optimize the power consumption and execution time needed for a specific task, an
internal prescaler feature has been implemented between the oscillator and the CPU
and peripherals.
Registers
Table 14. CKRL Register
CKRL – Clock Reload Register (97h)
Reset Value = 1111 1111b
Not bit addressable
Table 15. PCON Register
PCON – Power Control Register (87h)
Reset Value = 00X1 0000b Not bit addressable
765
4
3
2
1
0
CKRL7
CKRL6
CKRL5
CKRL4
CKRL3
CKRL2
CKRL1
CKRL0
Bit Number
Mnemonic
Description
7:0
CKRL
Clock Reload Register
Prescaler value
76
54
32
1
0
SMOD1
SMOD0
-
POF
GF1
GF0
PD
IDL
Bit Number
Bit Mnemonic
Description
7SMOD1
Serial Port Mode bit 1
Set to select double baud rate in mode 1, 2 or 3.
6SMOD0
Serial Port Mode bit 0
Cleared to select SM0 bit in SCON register.
Set to select FE bit in SCON register.
5-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4POF
Power-off Flag
Cleared by software to recognize the next reset type.
Set by hardware when V
CC rises from 0 to its nominal voltage. Can
also be set by software.
3GF1
General-purpose Flag
Cleared by software for general-purpose usage.
Set by software for general-purpose usage.
2GF0
General-purpose Flag
Cleared by software for general-purpose usage.
Set by software for general-purpose usage.
1PD
Power-down Mode bit
Cleared by hardware when reset occurs.
Set to enter power-down mode.
0IDL
Idle Mode bit
Cleared by hardware when interrupt or reset occurs.
Set to enter idle mode.



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