M3727GM6 Datasheet, PDF (94/129 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

M3727GM6/M8–XXXSP/FP M37272E8SP/FP
Reset
High-speed operation start
mode
8 MHz oscillating
32 kHz oscillating
φ is stopped ( H )
Timer operating
8 MHz oscillating
32 kHz oscillating
φ is stopped ( H )
Timer operating
(See note 3)
8 MHz stopped
32 kHz oscillating
φ is stopped ( H )
Timer operating
(See note 3)
WIT instruction
Interrupt
External INT,
timer interrupt,
or SI/O interrupt
8 MHz oscillating
32 kHz oscillating
f(φ) = 4 MHz
STP instruction
Interrupt (See note 1)
CM7 = 0
External INT
8 MHz stopped
32 kHz stopped
φ is stopped ( H )
CM7 = 1
WIT instruction
Interrupt
8 MHz oscillating
32 kHz oscillating
f(φ) = 16kHz
STP instruction
Interrupt (See note 2)
8 MHz stopped
32 kHz stopped
φ is stopped ( H )
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 (See note 2)
8 MHz stopped
32 kHz stopped
φ = stopped ( H )
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 1s.
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.1.00 Apr 01, 2001 page 94 of 127
REJ03B0132-0100Z