m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 63

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

Fig. 49 Clock generating circuit block diagram
Interrupt disable flag I
Interrupt request
X
CIN
X
Q
IN
S
R
Reset
High-speed mode
“1”
X
STP instruction
COUT
X
Notes
OUT
Middle/
Main clock stop bit (Note 3)
“0”
Port X
1 : When selecting the low-speed mode, set the port X
2 : Refer to the structure of timer 12 mode register.
3 : Refer to the structure of CPU mode register (next page).
Low-speed mode
Internal system clock selection bit
C
“1”
“1”
“0”
“0”
switch bit (Note 3)
(Note 1, 3)
1/2
WIT
instruction
High-speed mode
or Low-speed mode
1/4
R
S
Main clock division ratio selection bit (Note 3)
Middle-speed mode
1/2
Q
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Timer 1 count
source selection
bit (Note 2)
“1”
“0”
Q
MITSUBISHI MICROCOMPUTERS
S
R
Timer 1
C
switch bit to “1”.
STP instruction
Timing
(Internal clock)
3819 Group
49