m38039g6hsp Renesas Electronics Corporation., m38039g6hsp Datasheet - Page 48

• Manufacturer Part Number: m38039g6hsp
• Description: Single-chip 8-bit Cmos Microcomputer
• Manufacturer: Renesas Electronics Corporation.

3803 Group (Spec.H QzROM version)
Rev.1.10
REJ03B0166-0110
• Serial I/O2
The serial I/O2 function can be used only for clock synchronous
serial I/O.
For clock synchronous serial I/O2, 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
(address 001F
[Serial I/O2 Control Register (SIO2CON)] 001D
The serial I/O2 control register contains eight bits which control
various serial I/O2 functions.
Fig 38. Block diagram of serial I/O2
P5
P5
P5
P5
(f(X
3
1
2
/S
/S
/S
0
f(X
CIN
/S
OUT2
RDY2
CLK2
IN2
IN
) in low-speed mode)
)
16
Nov 14, 2005
).
S
Serial I/O2 port selection bit
Serial I/O2 port selection bit
RDY2
output enable bit
P5
“0”
“1”
“1”
“0”
“0”
P5
P5
“1”
3
1
2
latch
Page 48 of 91
latch
latch
S
RDY2
Synchronization
circuit
Serial I/O2 synchronous
clock selection bit
16
External clock
Fig 37. Structure of Serial I/O2 control register
“1”
Serial I/O counter 2 (3)
b7
“0”
Serial I/O2 register (8)
1/8
1/16
1/32
1/64
1/128
1/256
b0
Serial I/O2 control register
(SIO2CON : address 001D
Internal synchronous clock selection bits
Serial I/O2 port selection bit
S
Transfer direction selection bit
Serial I/O2 synchronous clock selection bit
P5
Address 001F
b2 b1 b0
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
0: I/O port
1: S
0: I/O port
1: S
0: LSB first
1: MSB first
0: External clock
1: Internal clock
0: CMOS output (in output mode)
1: N-channel open drain output (in output mode)
RDY2
1
/S
OUT2
RDY2
OUT2
output enable bit
Internal synchronous
clock selection bits
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
, S
signal output
P-channel output disable bit
CLK2
IN
IN
IN
IN
IN
IN
16
)/8 (f(X
)/16 (f(X
)/32 (f(X
)/64 (f(X
)/128 f(X
)/256 (f(X
signal output
Data bus
CIN
CIN
CIN
CIN
CIN
16
CIN
)/8 in low-speed mode)
)
)/16 in low-speed mode)
)/32 in low-speed mode)
)/64 in low-speed mode)
)/128 in low-speed mode)
)/256 in low-speed mode)
Serial I/O2
interrupt request