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M34551E8 View Datasheet(PDF) - MITSUBISHI ELECTRIC

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M34551E8 Datasheet PDF : 68 Pages
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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.
q Clock generating circuit
q Control circuit to stop the clock oscillation
q System clock (STCK) selection circuit
q Instruction clock (INSTCK) generating circuit
q Control circuit to return from the power down state
MR0
XIN
XOUT
OSC
XCIN
XCOUT
POF instruction
OSC
R
Q
S
Multiplexer
Frequency
dividing circuit
(divided by 4)
MR3
1
0
Internal clock
generating circuit
(divided by 3)
INSTCK
STCK
MR1
POF2 instruction
R
SQ
RESET
T2F flag
Falling detected Ports P0, P1
Fig. 37 Clock control circuit structure
(1) Clock control register
q Clock control register MR
Register MR controls the system clock. Set the contents
of this register through register A with the TMRA
instruction. In addition, the TAMR instruction can be used
to transfer the contents of register MR to register A.
Table 18 Clock control register
Clock control register MR
at reset : 10002
at power down : state retained
MR3 System clock (STCK) selection bit
MR0=0 f(XIN)
0
MR0=1 f(XCIN)
MR0=0 f(XIN)/4
1
MR0=1 f(XCIN)/4
MR2 f(XCIN) oscillation circuit control bit
0 f(XCIN) oscillation stop, ports D6 and D7 selected
1 f(XCIN) oscillation enabled, ports D6 and D7 not selected
MR1 f(XIN) oscillation circuit control bit
0 Oscillation enabled
1 Oscillation stop
MR0 Clock selection bit
0 f(XIN)
1 f(XCIN)
Note: “R” represents read enabled, and “W” represents write enabled.
R/W
36
 

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