參數(shù)資料
型號： HD40L4818
廠商： Hitachi,Ltd.
英文描述： 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
中文描述： 4位單片機(jī)（4位單片微計(jì)算機(jī)）
文件頁數(shù)： 17/98頁
文件大小： 621K
代理商： HD40L4818
HD404818 Series
17
Reset
Setting the RESET pin high resets the MCU. At power-on or when cancelling the stop mode for the
oscillator, apply the reset input for at least t
RC
for the oscillator to stabilize. In all other cases, at least two
instruction cycles of reset input are required for the MCU reset.
Table 1 shows the components initialized by MCU reset, and each of its status.
Table 1 Initial Values after MCU Reset
Items
Initial Value
Contents
Program counter (PC)
$0000
Execute program from the top of the ROM
address
Status flag (ST)
1
Enable branching with conditional branch
instructions
Stack pointer (SP)
$3FF
Stack level is 0
V register (bank register) (V)
0
Bank 0 (memory)
Interrupt
flags/mask
Interrupt enable flag (IE)
0
Inhibit all interrupts
Interrupt request flag (IF)
0
No interrupt request
Interrupt mask (IM)
1
Masks interrupt request
I/O
Port data register (PDR)
All bits are 1
Enable to transmit high
Data control register (DCR)
All bits are 0
Output buffer is off (high impedance)
Port mode register A (PMRA)
0000
See Port Mode Register A section
Port mode register B (PMRB)
0000
See Port Mode Register B section
Timer/counters,
serial interface
Timer mode register A (TMA)
0000
See Timer Mode Register A section
Timer mode register B (TMB)
0000
See Timer Mode Register B section
Timer mode register C (TMC)
0000
See Timer Mode Register C section
Serial mode register (SMR)
0000
See Serial Mode Register section
Prescaler S
$000
Prescaler W
$00
Timer counter A (TCA)
$00
Timer counter B (TCB)
$00
Timer counter C (TCC)
$00
Timer load register B (TLR)
$00
Timer load register C (TCR)
$00
Octal counter
000
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