參數(shù)資料
型號(hào): AT89C51RB2-SLSIM
廠商: Atmel
文件頁數(shù): 34/127頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 16K 44PLCC
標(biāo)準(zhǔn)包裝: 27
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 60MHz
連通性: SPI,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 32
程序存儲(chǔ)器容量: 16KB(16K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
配用: AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
14
AT89C51RB2/RC2
4180E–8051–10/06
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 13. CKRL Register
CKRL – Clock Reload Register (97h)
Reset Value = 1111 1111b
Not bit addressable
Table 14. 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 to recognize 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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