参数资料
型号: AT89C51RB2-RLRIM
厂商: Atmel
文件页数: 111/127页
文件大小: 0K
描述: IC MCU FLASH 8051 16K 5V 44-VQFP
标准包装: 1
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 60MHz
连通性: SPI,UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 16KB(16K x 8)
程序存储器类型: 闪存
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LQFP
包装: 剪切带 (CT)
配用: AT89STK-11-ND - KIT STARTER FOR AT89C51RX2
其它名称: AT89C51RB2RLRIMCT
84
AT89C51RB2/RC2
4180E–8051–10/06
Power-off Flag
The Power-off flag allows the user to distinguish between a “cold start” reset and a
“warm start” reset.
A cold start reset is the one induced by VCC switch-on. A warm start reset occurs while
VCC is still applied to the device and could be generated by an exit from Power-down.
The Power-off flag (POF) is located in PCON register (Table 63). POF is set by hard-
ware when VCC rises from 0 to its nominal voltage. The POF can be set or cleared by
software allowing the user to determine the type of reset.
Table 63. PCON Register
PCON - Power Control Register (87h)
Reset Value = 00X1 0000b
Not bit addressable
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 VCC rises from 0 to its nominal voltage. Can also be set by
software.
3GF1
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
2GF0
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user 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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