µPD178023, 178024
3.6 Serial Interface
The µPD178023 and 178024 have three serial interface channels.
• Serial interface (IIC0)
• Serial interface (SIO3)
• Serial interface (UART0)
Figure 3-8. Block Diagram of Serial Interface (IIC0)
Internal bus
IIC status register 0
(IICS0)
MSTS0 ALD0 EXC0 COI0 TRC0 ACKD0 STD0 SPD0
IIC control register 0
(IICC0)
Slave address
register 0 (SVA0)
IICE0 LREL0 WREL0 SPIE0 WTIM0 ACKE0 STT0 SPT0
SDA0/P76
Coincidence
signal
CLEAR
SET
Noise elimination
circuit
SO0 latch
IIC shift register 0
(IIC0)
D
Q
CL01,
CL00
Data hold
time correction
circuit
ACK detection
circuit
N-ch open-
drain output
Wake up control
circuit
ACK detection circuit
Start condition
detection circuit
Stop condition
detection circuit
SCL0/P77
Interrupt request
signal generator
Noise elimination
circuit
INTIIC0
Serial clock counter
Serial clock wait
control circuit
Serial clock control circuit
fX
Prescaler
IIC transfer clock select
register 0 (IICCL0)
CLD0 DAD0 SMC0 DFC0
CL01 CL00
Internal bus
24
Data Sheet U14126EJ1V0DS00
NEC [ NEC ]
