M30622M4 MITSUBISHI [Mitsubishi Electric Semiconductor], M30622M4 Datasheet - Page 43

• Manufacturer Part Number: M30622M4
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Clock Generating Circuit
Figure 1.13.4. Clock control registers 0 and 1
Figure 1.13.4 shows the system clock control registers 0 and 1.
b7
b7
System clock control register 0 (Note 1)
System clock control register 1 (Note 1)
Note 1: Set bit 0 of the protect register (address 000A
Note 2: Changes to “1” when shiffing to stop mode and at a reset.
Note 3: When entering power saving mode, main clock stops using this bit. When returning from stop mode and
Note 4: When inputting external clock, only clock oscillation buffer is stopped and clock input is acceptable.
Note 5: If this bit is set to “1”, X
Note 6: Set port Xc select bit (CM04) to “1” and stabilize the sub-clock oscillating before setting to this bit from “0” to “1”.
Note 7: This bit changes to “1” when shifting from high-speed/medium-speed mode to stop mode and at a reset. When
Note 8: f
Note 1: Set bit 0 of the protect register (address 000A
Note 2: This bit changes to “1” when shifting from high-speed/medium-speed mode to stop mode and at a reset. When
Note 3: Can be selected when bit 6 of the system clock control register 0 (address 0006
Note 4: If this bit is set to “1”, X
b6
b6
b5
b5
operating with X
bit (CM07) to “1” before setting this bit to “1”.
pulled up to X
Do not write to both bits at the same time. And also, set the main clock stop bit (CM05) to “0” and stabilize the
main clock oscillating before setting this bit from “1” to “0”.
shifting from low-speed/low power dissipation mode to stop mode, the value before stop mode is retained.
shifting from low-speed/low power dissipation mode to stop mode, the value before stop mode is retained.
fixed at 8.
impedance state.
C32
b4
b4
0
b3
b3
0
is not included.
b2
b2
0
b1
b1
0
b0
b0
OUT
IN
Bit symbol
Bit symbol
, set this bit to “0”. When main clock oscillation is operating by itself, set system clock select
(“H”) via the feedback resistor.
Reserved bit
Reserved bit
Reserved bit
Reserved bit
CM01
CM02
CM03
CM04
CM05
CM06
CM07
CM10
CM15
CM16
CM17
CM00
Symbol
CM0
Symbol
CM1
OUT
OUT
turns “H”. The built-in feedback resistor remains being connected, so X
turns “H”, and the built-in feedback resistor is cut off. X
Port X
Main clock division select
bit 0 (Note 7)
Main clock division
select bit 1 (Note 3)
Clock output function
select bit
(Valid only in single-chip
mode)
WAIT peripheral function
clock stop bit
X
select bit (Note 2)
Main clock (X
stop bit (Note 3, 4, 5)
System clock select bit
(Note 6)
All clock stop control bit
(Note4)
X
select bit (Note 2)
CIN
IN
-X
-X
OUT
C
COUT
select bit
Bit name
Bit name
drive capacity
drive capacity
Address
Address
IN
0006
0007
-X
16
16
OUT
16
) to “1” before writing to this register.
16
) to “1” before writing to this register.
)
When reset
When reset
0 : Do not stop peripheral function clock in wait mode
1 : Stop peripheral function clock in wait mode (Note 8)
0 : LOW
1 : HIGH
0 0 : I/O port P5
0 1 : f
1 0 : f
1 1 : f
0 : I/O port
1 : X
0 : On
1 : Off
0 : CM16 and CM17 valid
1 : Division by 8 mode
0 : X
1 : X
0 : Clock on
1 : All clocks off (stop mode)
b7 b6
0 0 : No division mode
0 1 : Division by 2 mode
1 0 : Division by 4 mode
1 1 : Division by 16 mode
b1 b0
Always set to
Always set to
Always set to
Always set to
0 : LOW
1 : HIGH
48
20
CIN
IN
CIN
16
C
8
32
16
, X
output
output
-X
, X
output
OUT
COUT
COUT
“0”
“0”
“0”
“0”
generation
7
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Function
Function
16
) is “0”. If “1”, division mode is
CIN
and X
COUT
Mitsubishi microcomputers
turn high-
M16C / 62 Group
IN
turns
R
R
W
W
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