PD17012_15 Datasheet, PDF (271/320 Pages) Renesas Technology Corp – 4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DIGITAL TUNING SYSTEM HARDWARE

µPD17012, 17P012
22. RESET
The reset function is used to initialize the device operation.
22.1 Configuration of Reset Block
Figure 22-1 shows the configuration of the reset block.
The device is reset in two ways: by applying supply voltage VDD (power-on reset or VDD reset) and by using
the CE pin (CE reset).
The power-on reset block consists of a voltage detector that detects a voltage input to the VDD pin, a power
failure detector, and a reset controller.
The CE reset block consists of a circuit that detects the rising of a signal input to the CE pin, and a reset
controller.
Figure 22-1. Configuration of Reset Block
XOUT
XIN
VDD
CE
STOP s
instruction
Voltage
detector
Rising
detector
Power failure detection block
Timer FF block
Divider
Selector
BTM0CY flag read
R
S
Q
Basic timer 0 carry
disable FF
Basic timer 0 carry
Power-on-clear signal (POC)
Reset signal
IRES
Reset controller
RES
RESET
Forced halt by basic
timer 0 carry
Control register
System register
Stack
Program counter
STOP instruction
Data Sheet U10101EJ4V0DS
269