MITSUBISHI MICROCOMPUTERS
3827 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
TOUT/φ CLOCK OUTPUT FUNCTION
The internal system clock φ or timer 2 divided by 2 (TOUT output)
can be output from port P43 by setting the TOUT/φ output control
bit (bit 1) of the timer 123 mode register and the TOUT/φ output
control register. Set bit 3 of the port P4 direction register to “1”
when outputting the clock.
b7
b0
TOUT/φ output control register
(CKOUT : address 002A16)
TOUT/φ output control bit
0 : φ clock output
1 : TOUT output
Not used (return “0” when read)
b7
b0
Timer 123 mode register
(T123M : address 002916)
TOUT output active edge switch bit
0 : Start on “H” output
1 : Start on “L” output
TOUT/φ output control bit
0 : TOUT/φ output disable
1 : TOUT/φ output enable
Timer 2 write control bit
0 : Write data in latch and timer
1 : Write data in latch only
Timer 2 count source selection bit
0 : Timer 1 output
1 : f(XIN)/16
(or f(XCIN)/16 in low-speed mode✽)
Timer 3 count source selection bit
0 : Timer 1 output
1 : f(XIN)/16
(or f(XCIN)/16 in low-speed mode✽)
Timer 1 count source selection bit
0 : f(XIN)/16
(or f(XCIN)/16 in low-speed mode✽)
1 : f(XCIN)
Not used (return “0” when read)
✽: Internal clock φ is f(XCIN)/2 in low-speed mode.
Fig. 47 Structure of TOUT/φ output-related register
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MITSUBISHI [ Mitsubishi Group ]
