參數(shù)資料
型號: ST72141K2B3/XXX
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封裝: 0.400 INCH, PLASTIC, SDIP-32
文件頁數(shù): 48/133頁
文件大小: 2615K
代理商: ST72141K2B3/XXX
Obsolete
Product(s)
- Obsolete
Product(s)
ST72141K2
21/133
RESET MANAGER (Cont’d)
Internal Low Voltage Detection RESET (option)
Two different RESET sequences caused by the in-
ternal LVD circuitry can be distinguished:
- LVD Power-On RESET
- Voltage Drop RESET
In the second sequence, a “delay” phase is used
to keep the device in RESET state until VDD rises
up to VLVDr (see Figure 13).
Figure 13. LVD RESET Sequences
RESET
RUN
INTERNAL RESET
4096 CLOCK CYCLES
FETCH
VECTOR
POWER-
RESET PIN
EXTERNAL RESET SOURCE
WATCHDOG RESET
RESET
RUN
INTERNAL RESET
4096 CLOCK CYCLES
FETCH
VECTOR
RUN
RESET PIN
EXTERNAL RESET SOURCE
VDD
VDDnominal
WATCHDOG RESET
DELAY
VLVDr
VLVDf
VDD
VDDnominal
VLVDr
LVD
POW
E
R-O
N
RE
SET
V
O
LTAGE
DROP
RESET
OFF
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