5 INITIAL RESET
S1C17001 TECHNICAL MANUAL
EPSON
25
5 Initial Reset
5.1 Initial Reset Factors
Shown below are the three different initial reset factors for initializing S1C17001 internal circuits.
(1) External initial reset via #RESET pin
(2) External initial reset via P0 port (pins P00 to P03) key entry (set by software)
(3) Internal initial reset via watchdog timer (set by software)
Figure 5.1.1 illustrates the initial reset circuit configuration.
Digital noise
filter
Key reset
control circuit
Chattering filter
circuit
Internal
reset
S
R
Q
#RESET
P00
P01
P02
P03
P0KRST
WDTMD
Watchdog timer
Oscillation stabilization
standby circuit
Figure 5.1.1: Initial reset circuit configuration
The CPU and peripheral circuits are initialized by initial reset factors. The CPU begins reset processing once the
factors are canceled.
This causes the reset vector to be read from the start of the vector table, and the program (initialization routine)
starting at that address to be executed.
5.1.1 #RESET
pin
Initial resetting is possible by inputting external Low level to the #RESET pin.
To initialize the S1C17001 reliably, the #RESET pin must be maintained at Low level for at least the specified du-
ration after the power supply voltage rises. (Refer to “24.5 AC Characteristics.”)
Initial resetting is canceled if the #RESET input changes from Low to High, and the CPU begins reset interrupt
processing.
The #RESET pin incorporates a pull-up resistance.
Содержание S1C17001
Страница 1: ...Technical Manual S1C17001 CMOS 16 BIT SINGLE CHIP MICROCONTROLLER ...
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