M37281EKSP Datasheet, PDF (121/172 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

M37281MAH–XXXSP,M37281MFH–XXXSP,M37281MKH–XXXSP, M37281EKSP
Reset
High-speed operation start
mode
8 MHz oscillating
32 kHz oscillating
φ is stopped (HIGH)
Timer operating
WIT instruction
Interrupt
External INT,
timer interrupt,
or SI/O interrupt
8 MHz oscillating
32 kHz oscillating
f(φ) = 4 MHz
STP instruction
Interrupt (Note 1)
CM7 = 0
External INT
8 MHz stopped
32 kHz stopped
φ is stopped (HIGH)
CM7 = 1
8 MHz oscillating
32 kHz oscillating
φ is stopped (HIGH)
Timer operating
(Note 3)
8 MHz stopped
32 kHz oscillating
φ is stopped (HIGH)
Timer operating
(Note 3)
WIT instruction
Interrupt
8 MHz oscillating
32 kHz oscillating
f(φ) = 16 kHz
STP instruction
Interrupt (Note 2)
8 MHz stopped
32 kHz stopped
φ is stopped (HIGH)
CM6 = 1
CM6 = 0
The program must
allow time for 8 MHz
oscillation to stabilize
WIT instruction
Interrupt
8 MHz stopped
32 kHz oscillating
f(φ) = 16 kHz
STP instruction
Interrupt (Note 2)
8 MHz stopped
32 kHz stopped
φ = stopped (HIGH )
CPU mode register
(Address : 00FB16)
CM6 : Main clock (XIN–XOUT) stop bit
0 : Oscillating
1 : Stopped
CM7 : Internal system clock selection bit
0 : XIN-XOUT selected (high-speed mode)
1 : XCIN-XCOUT selected (low-speed mode)
The example assumes that 8 MHz is being applied to the XIN pin and 32 kHz to the XCIN pin. The φ indicates the internal clock.
Notes 1: When the STP state is ended, a delay of approximately 4 ms is automatically generated by timer 3 and timer 4.
2: The delay after the STP state ends is approximately 1 s.
3: When the internal clock φ divided by 8 is used as the timer count source, the frequency of the count source is 2 kHz.
Fig.8.14.4 State Transitions of System Clock
Rev.1.01 2003.07.16 page 121 of 170