3822 datasheet(56/328 Pages) RENESAS

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1-41

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

3822 Group

Fig. 41 State transitions of internal clock

Notes 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 returned to the source mode when the stop mode or the wait

mode is ended.

3 : Timer and LCD operate in the wait mode.

4 : When the stop mode is ended, a delay of approximately 1 ms occurs automatically by 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 automatically by timer 1 and timer 2 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 XCIN pin.

φ indicates the internal clock.

CM4 : Port Xc switch bit

0: I/O port

1: XCIN, XCOUT

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)

CPU mode register

(CPUM : address 003B16)

Reset

CM6

“0”

“1”

CM7=0(8 MHz selected)

CM6=1(Middle-speed)

CM5=0(8 MHz oscillating)

CM4=0(32 kHz stopped)

Middle-speed mode (f(

φ) =1 MHz)

CM7=0(8 MHz selected)

CM6=1(Middle-speed)

CM5=0(8 MHz oscillating)

CM4=1(32 kHz oscillating)

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=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=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=1(Middle-speed)

CM5=1(8 MHz stopped)

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)

Low-speed mode (f(

φ) =16 kHz)

CM6

“0”

“1”

CM6

“0”

“1”

CM6

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

“1”

“0”

3822 Datasheet(PDF) 56 Page - Renesas Technology Corp

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