
CHAPTER 25 RESET FUNCTIONS
Preliminary User’s Manual U17790EJ1V0UD
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25.3 Operation
25.3.1 Reset operation via RESET pin
When a low level is input to the RESET pin, the system is reset, and each hardware unit is initialized.
When the level of the RESET pin is changed from low to high, the reset status is released.
Table 25-1. Hardware Status on RESET Pin Input
Item
During Reset
After Reset
Main clock oscillator (fX)
Oscillation stops
Oscillation starts
Subclock oscillator (fXT)
Oscillation continues
Internal oscillator
Oscillation stops
Oscillation starts
Peripheral clock (fX to fX/1,024)
Operation stops
Operation starts after securing oscillation
stabilization time
Internal system clock (fCLK),
CPU clock (fCPU)
Operation stops
Operation starts after securing oscillation
stabilization time (initialized to fXX/8)
CPU
Initialized
Program execution starts after securing
oscillation stabilization time
Watchdog timer 2
Operation stops (initialized to 0)
Counts up from 0 with internal oscillation
clock as source clock.
Internal RAM
Undefined if power-on reset or CPU access and reset input conflict (data is damaged).
Otherwise value immediately after reset input is retained.
I/O lines (ports/alternate-function
pins)
High impedance
Note
On-chip peripheral I/O registers
Initialized to specified status, OCDM register is set (01H).
Other on-chip peripheral functions
Operation stops
Operation can be started after securing
oscillation stabilization time
Note
When the power is turned on, the following pin may output an undefined level temporarily even during reset.
 P53/SIB2/KR3/TIQ00/TOQ00/RTP03/DDO pin
Caution
The OCDM register is initialized by the RESET pin input. Therefore, note with caution that, if a
high level is input to the P05/DRST pin after a reset release before the OCDM.OCDM0 bit is
cleared, the V850ES/SJ3 may enter on-chip debug mode. For details, refer to CHAPTER 4 PORT
FUNCTIONS.