參數(shù)資料
型號: M3455AG8FP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP52
封裝: 10 X 10 MM, 0.65 MM PITCH, PLASTIC, LQFP-52
文件頁數(shù): 99/150頁
文件大?。?/td> 1818K
代理商: M3455AG8FP
Rev.1.02
Nov 26, 2008
Page 50 of 146
REJ03B0224-0102
455A Group
RESET FUNCTION
System reset is performed by the followings:
“L” level is applied to the RESET pin externally,
System reset instruction (SRST) is executed,
Reset occurs by watchdog timer,
Reset occurs by built-in power-on reset
Reset occurs by voltage drop detection circuit
Then when “H” level is applied to RESET pin, software starts
from address 0 in page 0.
Fig 48. Structure of RESET pin and its peripherals
Note 1. Output latch is set to “1.”
Note 2. The output structure is N-channel open-drain.
Note 3. Pull-up transistor is turned OFF.
Notes 1:
This symbol represents a parasitic diode.
2: Applied potential to RESET pin must be VDD or less.
Power-on reset circuit
Watchdog reset signal
WEF
SRST instruction
Internal reset signal
(Note 1)
RESET pin
(Note 2)
Pull-up transistor
Voltage drop
detection circuit
(Note 1)
Table 21 Port state at reset
Name
Function
State
D0
D4
D0
D4
High-impedance (Notes 1, 2)
D5/INT
D5
High-impedance (Notes 1, 2)
XCIN/D6
, XCOUT/D7
XCIN
, XCOUT
Sub-clock input
P00/SEG16
P03/SEG19
P00
P03
High-impedance (Notes 1, 2, 3)
P10/SEG20
P13/SEG23
P10
P13
High-impedance (Notes 1, 2, 3)
P20/SEG24
P23/SEG27
P20
P23
High-impedance (Notes 1, 2, 3)
P30/SEG28
P33/SEG31
P30
P33
High-impedance (Notes 1, 2, 3)
SEG0/VLC3
SEG2/VLC1
SEG0
SEG2
VLC3 (VDD) level
SEG3
SEG15
SEG3
SEG15
VLC3 (VDD) level
COM0
COM3
COM0
COM3
VLC3 (VDD) level
C/CNTR
“L” (VSS) level
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