LAPIS Semiconductor ML610471, User Manual, Page: 59 / 281

ML610471/472/473/Q471/Q472/Q473 User's Manual
Chapter 4 MCU Control Function
4-11
4.3.3.2 STOP Mode When CPU Operates with High-Speed Clock
When the CPU is operating with the high-speed clock and the STP bit of SBYCON is set to “1” with the stop code
acceptor enabled, the STOP mode is entered and high-speed oscillation and low-speed oscillation stop.
When any of the P00 to P03 interrupt request occurs with the interrupt enabled (interrupt enabled flag is "1") state, the
STP bit becomes "0" and the high-speed and low-speed oscillation resumes.
When an interrupt request is issued, the STOP mode is released after the elapse of the high-speed oscillation start time
(T
RC
) and the high-speed clock (OSCLK) oscillation stabilization time (16-pulse count), the mode is returned to the
program run mode, and the high-speed clocks (OSCLK and HSCLK) restart supply to the peripheral circuits.
The low-speed clock (LSCLK) restarts supply to the peripheral circuits after the elapse of the low-speed oscillation start
time (T
XTL
) and low-speed clock (LSCLK) oscillation stabilization time (8192 count).
For the high-speed oscillation start time (T
XTH
) and low-speed oscillation start time (T
XTL
), see the “Electrical
Characteristics” Section in Appendix C.
Figure 4-4 shows the operation waveforms in STOP mode when CPU operates with the high-speed clock.
Figure 4-4 Operation Waveforms in STOP Mode When CPU Operates with High-Speed Clock
Note:
Since up to two instructions are executed during the period between STOP mode release and a transition to interrupt
processing, place two NOP instructions next to the instruction that sets the STP bit to “1”.
Low-speed oscillation
waveform
Low-speed
High-speed oscillation waveform
High-speed oscillation waveform
High-speed oscillation
waveform
SBYCON.STP bit
LSCLK
OSCLK waveform
OSCLK waveform
OSCLK
Program run mode STOP mode Program run mode
Interrupt
request
T
XTL
High-speed oscillation 16 counts
SYSCLK,HSCLK waveform
T
RC
SYSCLK,HSCLK
8192 counts
SYSCLK, HSCLK
Hiz
Low-speed
oscillation
Maximum 1
count