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參數(shù)資料
| 型號(hào)： | M34551M8 |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 單芯片4位CMOS微機(jī)紅外遙控器 |
| 文件頁數(shù)： | 36/68頁 |
| 文件大?。?/td> | 698K |
| 代理商： | M34551M8 |
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36
MITSUBISHI MICROCOMPUTERS
4551 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER for
INFRARED REMOTE CONTROL TRANSMITTER
CLOCK CONTROL
The clock control circuit consists of the following circuits.
G
Clock generating circuit
G
Control circuit to stop the clock oscillation
G
System clock (STCK) selection circuit
G
Instruction clock (INSTCK) generating circuit
G
Control circuit to return from the power down state
Fig. 37 Clock control circuit structure
(1) Clock control register
G
Clock control register MR
Register MR controls the system clock. Set the contents
of this register through register A with the TMRA
OSC
X
IN
X
OUT
OSC
X
CIN
X
COUT
Internal clock
generating circuit
(divided by 3)
MR0
R
S
Q
R
S
Q
POF instruction
POF2 instruction
MR1
T2F flag
Falling detected
Ports P0, P1
RESET
Multiplexer
Frequency
dividing circuit
(divided by 4)
MR3
0
1
STCK
INSTCK
instruction. In addition, the TAMR instruction can be used
to transfer the contents of register MR to register A.
Table 18 Clock control register
System clock (STCK) selection bit
f(X
CIN
) oscillation circuit control bit
f(X
IN
) oscillation circuit control bit
Clock selection bit
at reset : 1000
2
at power down : state retained
Clock control register MR
R/W
MR
3
MR
2
MR
1
MR
0
MR
0
=0 f(X
IN
)
MR
0
=1 f(X
CIN
)
MR
0
=0 f(X
IN
)/4
MR
0
=1 f(X
CIN
)/4
f(X
CIN
) oscillation stop, ports D
6
and D
7
selected
f(X
CIN
) oscillation enabled, ports D
6
and D
7
not selected
Oscillation enabled
Oscillation stop
f(X
IN
)
f(X
CIN
)
0
1
0
1
0
1
0
1
Note: “R” represents read enabled, and “W” represents write enabled.
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