參數(shù)資料
型號: SST89E54RC-33-C-PIE
廠商: Microchip Technology
文件頁數(shù): 14/71頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 17KB FLASH 40PDIP
標準包裝: 9
系列: FlashFlex®
核心處理器: 8051
芯體尺寸: 8-位
速度: 33MHz
連通性: EBI/EMI,UART/USART
外圍設備: POR,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 1K x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 40-DIP(0.600",15.24mm)
包裝: 管件
2011 Silicon Storage Technology, Inc.
DS25088A
10/11
21
FlashFlex MCU
SST89E52RC / SST89E54RC
Data Sheet
A Microchip Technology Company
Symbol
Function
SFIS1
Register used with SFIS0 to provide a feed sequence to validate writing
to WDTC and SFCM.
Symbol
Function
WDTON
Watchdog timer start control bit (Used in Watchdog mode)
0: Watchdog timer can be started or stopped freely during Watchdog mode.
1: Start Watchdog timer; bit cannot be cleared by software.
WDFE
Watchdog feed sequence error flag
0: Watchdog feed sequence error has not occurred.
1: Due to an incorrect feed sequence before writing to WDTC in Watchdog mode, the
hardware entered Watchdog reset and set this flag to “1.” This is for software to detect
whether the Watchdog reset was caused by timer expiration or an incorrect feed
sequence.
WDRE
Watchdog timer reset enable.
0: Disable Watchdog timer reset.
1: Enable Watchdog timer reset.
WDTS
Watchdog timer reset flag.
0: External hardware reset or power-on reset clears the flag.
Flag can also be cleared by writing a 1.
Flag survives if chip reset happened because of Watchdog timer overflow.
1: Hardware sets the flag on watchdog overflow.
WDT
Watchdog timer refresh.
0: Hardware resets the bit when refresh is done.
1: Software sets the bit to force a Watchdog timer refresh.
SWDT
Start Watchdog timer.
0: Stop WDT.
1: Start WDT.
Sequence Register 1 (SFIS1)
Location
7
6
5
43210
Reset
Value
C4H
(Write only)
N/A
Watchdog Timer Control Register (WDTC)
Location
76543210
Reset
Value
C0H
-
WDTON
WDFE
-
WDRE
WDTS
WDT
SWDT
x0000000b
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