UPD784938 Datasheet, PDF (638/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

To watch timer
after division by 128
Figure 25-2. Standby Function Block Diagram
Oscillation stabilization
timer (19)
WM3
WM6
System
cock
oscillator
fxx Frequency
divider
fxx
fxx/2
fxx/4
fxx/8
OSTS0
OSTS1
OSTS2
EXTC
Selector
Selector
To peripheral circuit
RAM PROTECT
To peripheral circuit
CPU CLK
HLT F/F
QS
EXTC
Macro service
request
QR
IDLE F/F
QS
NMI
INTP4, INTP5
RESET
Rising edge
detection
Rising edge
detection
ESNMI
Selector
Falling edge
detection
Falling edge
detection
ES40, ES50
ES41, ES51
Valid edge
Selector
Interrupt
QR
STP F/F2
QS
QR
STP F/F1
QS
INTC
QR
MK
ISM
Macro service
request
INTW
MK
ISM
HALT bit setting
STOP bit setting