參數(shù)資料
型號: M34551E8FP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP48
封裝: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數(shù): 25/155頁
文件大?。?/td> 1329K
代理商: M34551E8FP
APPLICATION
2-42
4551 Group User’s Manual
2.6 Power down function
Function
Program counter (PC), registers A, B,
carry flag (CY), stack pointer (SP) (Note 2)
Contents of RAM
Port level
Clock control register MR
Timer control register W1
Timer control registers W2, W3
Interrupt control register V1
Interrupt control register I1
Carrier wave control registers and flag (C1, C2, CR)
LCD display function
LCD control registers L1, L2
Timer LC
Timer 1 function
Timer 2 function
External 0 interrupt request flag (EXF0)
Timer 1 interrupt request flag (T1F)
Timer 2 interrupt request flag (T2F)
Watchdog timer flag (WDF)
Watchdog timer enable flag (WEF)
Interrupt enable flag (INTE)
General-purpose register V2
Notes 1: “O” represents that the function can be retained, and “!” represents that the function is initialized.
Registers and flags other than the above are undefined at power down, and set an initial value
after returning from power down state.
2: The stack pointer (SP) points the level of the stack register and is initialized to “1112” at power down.
3: LCD is turned off.
4: The state of timer is undefined.
RAM back-up
!
O
!
O
!
O
!
(Note 3)
O
(Note 4)
!
O
!
O
!
O
!
Clock operating
!
O
!
O
!
O
!
O
!
O
!
O
!
Table 2.6.1 Functions and states retained at RAM back-up mode and the clock operating mode
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