M38203M4 Datasheet, PDF (228/344 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.6 Serial I/O2
sShift clock
Ordinarily, when clock synchronous transfer is performed between microcomputers, an internal clock
is selected for one of them, and it outputs 8 shift clocks generated by a start of transmit operation from
the P52/SCLK2 pin. An external clock is selected for the other microcomputer, and it uses the clock
input from the P52/SCLK2 pin as a shift clock. Figure 2.6.2 shows a shift clock.
3820 group Œ
XIN
1/8
1/16
1/32
1/64
1/128
1/256
Synchronization
circuit
SCLK2
Shift clock
SCLK2
Serial I/O2 register
8
SIN2
SOUT2
SOUT2
SIN2
3820 group 
Synchronization
circuit
Serial I/O2 register
8
Internal clock is selected
Fig. 2.6.2 Shift clock
External clock is selected
2–142
3820 GROUP USER’S MANUAL