參數(shù)資料
型號(hào)： UPD7566AGA
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 25/58頁(yè)
文件大?。?/td> 471K
代理商： UPD7566AGA
μ
PD7566A, 7566A(A)
25
4. RESET FUNCTION
The microcomputer is reset and initialized as follows, when an active-high RESET signal is input to the RESET
pin:
4.1 INITIALIZATION
(1)
The program counter (PC9 to PC0) is cleared to 0.
(2)
The skip flags (SK1 and SK0) for the program status word are reset to 0.
(3)
The count register for the timer/event counter is cleared to 00H.
(4)
The clock control circuit is initialized as follows:
Clock mode register (bits CM2 and 1) = 0
¨
CP = CL x
Prescalers 1, 2, and 3 = 0
The SM3 flag is reset to 0, disabling the external test input (INT0).
The test request flags (INTT RQF and INT0 RQF) are reset to 0.
The contents of the data memory and the following registers will become undefined.
Stack pointer (SP)
Accumulator (A)
Carry flag (C)
General-purpose registers (H and L)
Output latches for ports
The output buffers for all the ports are turned off and enter the output high-impedance state.
The I/O ports are set in the input mode.
(5)
(6)
(7)
(8)
Caution
When the RESET signal is used to released the standby mode, the contents of the data memory do
not become undefined, but are retained.
When the RESET signal is removed, the program is executed starting from address 000H. However, initialize
or reinitialize the contents for the registers by program.
1
256
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