3819 datasheet(64/218 Pages) RENESAS

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3819 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

Fig. 50 State transitions of system clock

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

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.

Timer operates in the wait mode.

When the stop mode is released in middle/high-speed mode, a delay of approximately 0.5 ms occurs automatically by timer 1.

When the stop mode is released in low-speed mode, a delay of approximately 0.125 s occurs automatically by timer 1.

The example assumes that 8 MHz is being applied to the XIN pin and 32 kHz to the XCIN pin.

φ indicates the internal clock.

Low power dissipation mode (

φ =16 kHz)

CM7 = 1 (32 kHz selected)

CM6 = 0 (High-speed)

CM5 = 1 (XIN stopped)

CM4 = 1 (32 kHz oscillating)

“1”

“0”

“1”

CPU mode register

(CPUM (CM) : address 003B 16)

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)

Notes 1 :

2 :

3 :

4 :

5 :

Reset

“1”

“0”

“1”

“0”

CM6

“1”

“0”

CM6

“1”

“0”

CM6

“1”

“0”

High-speed mode (

φ = 4 MHz)

CM7 = 0 (8 MHz selected)

CM6 = 0 (High-speed)

CM5 = 0 (XIN oscillating)

CM4 = 1 (32 kHz oscillating)

CM6

“1”

“0”

Middle-speed mode (

φ =1 MHz)

CM7 = 0 (8 MHz selected)

CM6 = 1 (Middle-speed)

CM5 = 0 (XIN oscillating)

CM4 = 1 (32 kHz oscillating)

Middle-speed mode (

φ =1 MHz)

CM7 = 0 (8 MHz selected)

CM6 = 1 (Middle-speed)

CM5 = 0 (XIN oscillating)

CM4 = 0 (32 kHz stopped)

High-speed mode (

φ = 4 MHz)

CM7 = 0 (8 MHz selected)

CM6 = 0 (High-speed)

CM5 = 0 (XIN oscillating)

CM4 = 0 (32 kHz stopped)

Low-speed mode (

φ =16 kHz)

CM7 = 1 (32 kHz selected)

CM6 = 1 (Middle-speed)

CM5 = 0 (XIN oscillating)

CM4 = 1 (32 kHz oscillating)

Low-speed mode (

φ = 16 kHz)

CM7 = 1 (32 kHz selected)

CM6 = 0 (High-speed)

CM5 = 0 (XIN oscillating)

CM4 = 1 (32 kHz oscillating)

Low power dissipation mode (

φ =16 kHz)

CM7 = 1 (32 kHz selected)

CM6 = 1 (Middle-speed)

CM5 = 1 (XIN stopped)

CM4 = 1 (32 kHz oscillating)

“1”

“0”

“1”

“0”

“1”

“0”

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