参数资料
型号: SST89C58RC-40-I-TQJE
厂商: Microchip Technology
文件页数: 60/88页
文件大小: 0K
描述: IC MCU 8BIT FLASH 40TQFP
标准包装: 160
系列: FlashFlex®
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: EBI/EMI,I²C,SMBus,UART/USART
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 32
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 1K 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-TQFP
包装: 托盘
2011 Silicon Storage Technology, Inc.
DS25100A
12/11
63
FlashFlex MCU
SST89C58RC
Data Sheet
A Microchip Technology Company
Feed Sequence
In Watchdog mode (WDRE=1), a feed sequence is needed to write into the WDTC register.
The correct feed sequence is:
1.
write FDH to SFIS1,
2.
write 2AH to SFIS0, then
3.
write to the WDTC register
An incorrect second or third instruction of the feed sequence causes an immediate reset in Watchdog
mode.
In Timer mode, the WDTC and WDTD can be written at any time. A feed sequence is not required.
Power Saving Considerations for Using the Watchdog Timer
During Idle mode, the Watchdog timer will remain active. The device should be awakened and the
Watchdog timer refreshed periodically before expiration. During Power-down mode, the Watchdog
timer is stopped. When the Watchdog timer is used as a pure timer, users can turn off the clock to save
power. See “Power Management Control Register (PMC)” on page 24.
Figure 23:Block Diagram of Programmable Watchdog Timer
1323 F47.0
WDT Upper Byte
WDT Reset
Internal Reset
344064
clks
Counter
CLK (XTAL1)
Ext. RST
WDTC
WDTD
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