參數(shù)資料
型號(hào)： UPD17235
廠商： NEC Corp.
元件分類： 4位微控制器
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
中文描述： 4位單片機(jī)的小型通用紅外遙控器
文件頁(yè)數(shù)： 59/92頁(yè)
文件大?。?/td> 378K
代理商： UPD17235
Data Sheet U14360EJ1V0DS00
μ
PD17230, 17231, 17232, 17233, 17234, 17235, 17236
59
9.
RESET
9.1
Reset by Reset Signal Input
When a low-level signal more than 10
μ
s is input to the RESET pin,
μ
PD17236 is reset.
When the system is reset, the oscillator circuit remains in the HALT mode and then enters an operation mode, like
when the STOP mode has been released. The wait time, after the reset signal has been removed, is 16.384 ms (f
X
= 4 MHz).
On power application, input the reset signal at least once because the internal circuitry operations are not stable.
When
μ
PD17225 is reset, the following initialization takes place:
(1) Program counter is reset to 0.
(2) Flags in the register file are initialized to their default values (for the default values, refer to
Figure 11-1
Register Files
).
(3) The default value (0320H) is written to the data buffer (DBF).
(4) The hardware peripherals are initialized.
(5) The system clock (f
X
) stops oscillation.
When the RESET pin is made high, the system clock starts oscillating, and the program execution starts from
address 0 about 16 ms (at 4 MHz) later.
Figure 9-1. Reset Operation by RESET Input
RESET
Wait
Starts from address 0H
(about 16 ms at 4 MHz)
Operation mode
or standby mode
HALT mode
Operation mode
Oscillation stops
9.2
Reset by Watchdog Timer (With RESET pin internally pulled down)
When the watchdog timer operates during program execution, the RESET pin is internally pulled down, and the
program counter is reset to 0 (normally, the RESET pin is pulled up).
If the watchdog timer is not reset for a fixed period of time, the program can be restarted from address 0H.
Program so that the watchdog timer is reset at intervals of within 340 ms (at f
X
= 4 MHz) (set the WDTRES flag).
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