m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 64

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

Fig. 50 State transitions of system clock
50
Low power dissipation mode ( =16 kHz)
Notes 1 :
CM
CM
CM
CM
Low-speed mode ( =16 kHz)
CM
CM
CM
CM
Middle-speed mode ( =1 MHz)
CM
CM
CM
CM
Middle-speed mode ( =1 MHz)
CM
CM
CM
CM
2 :
3 :
4 :
5 :
7
6
5
4
7
6
5
4
7
6
5
4
7
6
5
4
= 1 (32 kHz selected)
= 1 (Middle-speed)
= 1 (X
= 1 (32 kHz oscillating)
= 1 (32 kHz selected)
= 1 (Middle-speed)
= 0 (X
= 1 (32 kHz oscillating)
= 0 (8 MHz selected)
= 1 (Middle-speed)
= 0 (X
= 1 (32 kHz oscillating)
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 X
= 0 (8 MHz selected)
= 1 (Middle-speed)
= 0 (X
= 0 (32 kHz stopped)
Reset
IN
IN
IN
IN
stopped)
oscillating)
oscillating)
oscillating)
“1”
“1”
“1”
“1”
CM
CM
CM
CM
6
6
6
6
“0”
“0”
“0”
“0”
Low power dissipation mode ( =16 kHz)
CM
CM
CM
CM
Low-speed mode ( = 16 kHz)
CM
CM
CM
CM
High-speed mode ( = 4 MHz)
CM
CM
CM
CM
High-speed mode ( = 4 MHz)
CM
CM
CM
CM
7
6
5
4
7
6
5
4
7
6
5
4
7
6
5
4
= 1 (32 kHz selected)
= 0 (High-speed)
= 1 (X
= 1 (32 kHz oscillating)
= 1 (32 kHz selected)
= 0 (High-speed)
= 0 (X
= 1 (32 kHz oscillating)
= 0 (8 MHz selected)
= 0 (High-speed)
= 0 (X
= 1 (32 kHz oscillating)
= 0 (8 MHz selected)
= 0 (High-speed)
= 0 (X
= 0 (32 kHz stopped)
IN
pin and 32 kHz to the X
IN
IN
IN
IN
stopped)
oscillating)
oscillating)
oscillating)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
CIN
b7
pin.
indicates the internal clock.
MITSUBISHI MICROCOMPUTERS
CM
CM
CM
CM
0 : I/O port function
1 : X
0 : Oscillating
1 : Stopped
0 : f(X
1 : f(X
0 : X
1 : X
4
5
6
7
: Port X
: Main clock (X
: Main clock division ratio selection bit
: Internal system clock selection bit
(middle/high-speed mode)
(low-speed mode)
b0
CIN
IN
CIN
IN
IN
-X
CPU mode register
(CPUM (CM) : address 003B
-X
-X
)/2 (high-speed mode)
)/8 (middle-speed mode)
OUT
C
COUT
COUT
switch bit
selected
3819 Group
oscillating function
selected
IN
-X
OUT
) stop bit
16
)