M38C37ECAFP datasheet(39/62 Pages) MITSUBISHI

39 / 62 page

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

38C3 Group

CM4 : Port Xc switch bit

0: I/O port function

1: XCIN-XCOUT oscillating function

CM5 : Main clock (XIN- XOUT) stop bit

0: Oscillating

1: Stopped

CM6: Main clock division ratio selection bit

0: f(XIN)/2(High-speed mode)

1: f(XIN)/8 (Middle-speed mode)

CM7: Internal system clock selection bit

0: XIN–XOUT selected (Middle-/High-speed mode)

1: XCIN–XCOUT selected (Low-speed mode)

Reset

CM6

CPU mode register

(CPUM : address 003B 16)

CM6

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

CM7=0(8 MHz selected)

CM6=1(middle-speed)

CM5=0(8 MHz oscillating)

CM4=0(32 kHz stopped)

1: Switch the mode by the allows shown between the mode blocks. (Do not switch between the mode directly without an allow.)

2: The all modes can be switched to the stop mode or the wait mode and return to the source mode when the stop mode or the wait mode is ended.

3: Timer,LCD operate in the wait mode.

4: When the stop mode is ended, a delay of approximately 1 ms occurs by connecting Timer 1 and Timer 2 in middle-/high-speed mode.

5: When the stop mode is ended, a delay of approximately 0.25 s occurs in low-speed mode.

6: Wait until oscillation stabilizes after oscillating the main clock X IN before the switching from the low-speed mode to middle/high-speed mode.

7: The example assumes that 8 MHz is being applied to the X IN pin and 32 kHz to the X CIN pin.

φ indicates the internal system clock.

Middle-speed mode

(f(

φ)=1 MHz)

Middle-speed mode

((f(

φ)=1 MHz)

CM7=0(8 MHz selected)

CM6=0(high-speed)

CM5=0(8 MHz oscillating)

CM4=0(32 kHz stopped)

High-speed mode

(f(

φ) =4 MHz)

CM7=0(8 MHz selected)

CM6=0(high-speed)

CM5=0(8 MHz oscillating)

CM4=1(32 kHz oscillating)

High-speed mode

(f(

φ) =4 MHz)

CM7=1(32 kHz selected)

CM6=0(high-speed)

CM5=0(8 MHz oscillating)

CM4=1(32 kHz oscillating)

Low-speed mode

(f(

φ) =16 kHz)

CM7=1(32 kHz selected)

CM6=0(high-speed)

CM5=1(8 MHz stopped)

CM4=1(32 kHz oscillating)

CM7=0(8 MHz selected)

CM6=1(middle-speed)

CM5=0(8 MHz oscillating)

CM4=1(32 kHz oscillating)

CM7=1(32 kHz selected)

CM6=1(middle-speed)

CM5=0(8 MHz oscillating)

CM4=1(32 kHz oscillating)

Low-speed mode

((f(

φ)=16 kHz)

CM7=1(32 kHz selected)

CM6=1(middle-speed)

CM5=1(8 MHz stopped)

CM4=1(32 kHz oscillating)

Low-speed mode

(f(

φ) =16 kHz)

Low-speed mode

((f(

φ)=16 kHz)

Notes

Fig. 43 State transitions of system clock

M38C37ECAFP Datasheet(PDF) 39 Page - Mitsubishi Electric Semiconductor

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