M37151 datasheet(97/139 Pages) RENESAS

97 / 139 page

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP

MITSUBISHI MICROCOMPUTERS

Rev. 1.0

Fig.8.14.5 State Transitions of System Clock

Reset

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.

WIT instruction

CM7 : Internal system clock selection bit

0 : XIN-XOUT selected (high-speed mode)

1 : XCIN-XCOUT selected (low-speed mode)

CPU mode register

(Address : 00FB16)

CM6 : Main clock (XIN–XOUT) stop bit

0 : Oscillating

1 : Stopped

8 MHz oscillating

32 kHz oscillating

φ is stopped (“H”)

Timer operating

8 MHz oscillating

32 kHz oscillating

φ) = 4 MHz

8 MHz stopped

32 kHz stopped

φ is stopped (“H”)

8 MHz oscillating

32 kHz oscillating

φ is stopped (“H”)

Timer operating

(See note 3)

8 MHz oscillating

32 kHz oscillating

φ) = 16kHz

8 MHz stopped

32 kHz stopped

φ is stopped (“H”)

8 MHz stopped

32 kHz stopped

φ = stopped (“H”)

8 MHz stopped

32 kHz oscillating

φ) = 16 kHz

8 MHz stopped

32 kHz oscillating

φ is stopped (“H”)

Timer operating

(See note 3)

Interrupt

STP instruction

Interrupt (See note 1)

WIT instruction

Interrupt

WIT instruction

Interrupt

STP instruction

Interrupt (See note 2)

STP instruction

Interrupt (See note 2)

CM7 = 1

CM7 = 0

CM6 = 1

CM6 = 0

External INT,

timer interrupt,

or SI/O interrupt

External INT

Notes 1: When the STP state is ended, a delay of approximately 8 ms is automatically generated by timer 3 and timer 4.

2: The delay after the STP state ends is approximately 2s.

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.

The program must

allow time for 8 MHz

oscillation to stabilize

High-speed operation start

mode

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