參數(shù)資料
型號(hào)： UPD75402AC
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)： 23/48頁(yè)
文件大小： 515K
代理商： UPD75402AC
23
μ
PD75402A(A)
8. RESET FUNCTION
When a low level signal is input to the RESET input pin, the state changes to the system reset. Table 8-1
shows the statuses of the hardware.
When the RESET signal rises from the low level to the high level, the reset state is released. The three low-
order bits of the reset vector table whose address is 000H is set in bits 10 to 8 of the program counter (PC)
and the contents of the reset vector table whose address is 001H is set in bits 7 to 0 of the PC. The program
branches to that address and starts execution, i.e., the reset start address is programmable.
Initialize contents of registers in a program if necessary.
The RESET pin connects to the Schmitt-trigger circuit whose threshold level has hysteresis in the chip. This
pin is also connected to the noise eliminator using an analog delay to eliminate narrow noise and prevent
errors caused by noise. (See Fig. 8-1
.
)
For the power-on reset operation, be sure to allow sufficient time for oscillation to settle between power
on and acceptance of the reset signal (see Fig. 8-2).
Fig. 8-1 Acceptance of the Reset Signal
RESET
Analog
delay
Analog
delay
Analog
delay
Content of the reset
vector table is set
to the PC
(the initialization of the PC).
The reset is
released.
The instruction which
is stored at the reset
branch address is executed.
Elimination
as noise.
This low level
signal is accepted
as the reset signal.
Fig. 8-2 Power-On Reset Operation
V
DD
RESET
Oscillation
settling time
Analog
delay
The reset
is released.
Content of the reset vector
table is set to the PC
(the initialization of the PC).
The instruction which is stored
at the reset branch address is
executed.
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