参数资料
型号: AT89C51ED2-SMRUM
厂商: Atmel
文件页数: 124/137页
文件大小: 0K
描述: IC MCU FLASH 8051 64K 5V 68PLCC
产品培训模块: MCU Product Line Introduction
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: 50
程序存储器容量: 64KB(64K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 2K 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: 68-PLCC
包装: 标准包装
其它名称: AT89C51ED2-SMRUMDKR
87
4235K–8051–05/08
AT89C51RD2/ED2
21. 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 for example by an exit from power-down.
The power-off flag (POF) is located in PCON register (Table 21-1). POF is set by hardware
when VCC rises from 0 to its nominal voltage. The POF can be set or cleared by software allow-
ing the user to determine the type of reset.
Table 21-1.
PCON Register
PCON - Power Control Register (87h)
Reset Value = 00X1 0000b
Not bit addressable
7
6
5
4
3
2
1
0
SMOD1
SMOD0
-
POF
GF1
GF0
PD
IDL
Bit
Number
Bit
Mnemonic
Description
7
SMOD1
Serial port Mode bit 1
Set to select double baud rate in mode 1, 2 or 3.
6
SMOD0
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.
4
POF
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.
3
GF1
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
2
GF0
General-purpose Flag
Cleared by user for general-purpose usage.
Set by user for general-purpose usage.
1
PD
Power-down mode bit
Cleared by hardware when reset occurs.
Set to enter power-down mode.
0
IDL
Idle mode bit
Cleared by hardware when interrupt or reset occurs.
Set to enter idle mode.
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