M38062M3-156FP MITSUBISHI [Mitsubishi Electric Semiconductor], M38062M3-156FP Datasheet - Page 23

• Manufacturer Part Number: M38062M3-156FP
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Serial I/O2
The serial I/O2 function can be used only for clock synchronous
serial I/O.
For clock synchronous serial I/O the transmitter and the receiver
must use the same clock. If the internal clock is used, transfer is
started by a write signal to the serial I/O2 register.
Serial I/O2 control register (SIO2CON) 001D
The serial I/O2 control register contains seven bits which control
various serial I/O functions.
Fig. 16 Block diagram of serial I/O2 function
P7
P7
P7
P7
3
2
1
/S
/S
/S
0
/S
RDY2
CLK2
OUT2
X
IN2
IN
Serial I/O2 port selection bit
Serial I/O2 port selection bit
S
RDY2
P7
P7
"0"
"1"
"0"
"1"
output enable bit
P7
"1"
2
1
"0"
latch
latch
3
latch
S
RDY2
Serial I/O2 synchronous
Synchronization circuit
clock selection bit
External clock
16
Serial I/O counter 2 (3)
Fig. 15 Structure of serial I/O2 control register
Serial I/O shift register 2 (8)
"1"
b7
"0"
1/8
1/16
1/32
1/64
1/128
1/256
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
b0
MITSUBISHI MICROCOMPUTERS
Serial I/O2 control register
(SIO2CON : address 001D
Internal synchronous
clock selection bits
b2 b1 b0
Internal synchronous clock selection bits
0 0 0: f(X
0 0 1: f(X
0 1 0: f(X
0 1 1: f(X
1 1 0: f(X
1 1 1: f(X
Serial I/O2 port selection bit
0: I/O port
1: S
S
0: I/O port
1: S
Transfer direction selection bit
0: LSB first
1: MSB first
Serial I/O2 synchronous clock selection bit
0: External clock
1: Internal clock
Not used (returns “0” when read)
RDY2
OUT2
RDY2
output enable bit
Data bus
,S
IN
IN
IN
IN
IN
IN
signal output
CLK2
)/8
)/16
)/32
)/64
)/128
)/256
signal output
3806 Group
Serial I/O2
interrupt request
16
)
23