PD178046_15 Datasheet, PDF (25/42 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCONTROLLER

µPD178046, 178048
3.5 Serial Interface
Two serial interface channels are provided.
• Serial interface (IIC1)
• Serial interface (SIO3)
Table 3-2. Types and Functions of Serial Interfaces
Function
I²C bus mode
3-wire serial I/O mode
IIC1
(MSB first)
—
(MSB first)
SIO3
—
Figure 3-9. Block Diagram of Serial Interface (IIC1)
SDA0/P22
SDA1/P23
SCL0/P20
SCL1/P21
Control
circuit
IIC1 shift register 1
(IIC1)
Output
latch
Control
circuit
Stop condition/start
condition/acknowledge
detection circuit
Acknowledge
output circuit
Control
circuit
Serial clock counter
Interrupt request signal
generation circuit
INTIIC1
Control
circuit
Serial clock control
circuit
fX/2⁴
fX/2⁵
fX/2⁶
fX/2⁷
Preliminary Product Information
23