UPD784031 Datasheet, PDF (39/90 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD784031
8.8.2 Synchronous serial interface (CSI)
With this interface, the master device makes the serial clock active to start transmission, then transfers 1-byte data
in phase with the clock.
Figure 8-12. Block Diagram of Synchronous Serial Interface
Internal bus
SI0
SO0/SDA
Direction
control circuit
Shift register
Set
Reset
Output latch
N-ch open-drain
output enabled
(when two-wire
mode is used)
SCK0/SCL
Serial clock
counter
Interrupt signal
generator
INTCSI
N-ch open-drain
output enabled
(when two-wire
mode is used)
CLS0
CLS1
Serial clock
control circuit
Timer 3 output
fXX/16
fXX/2
Remark fXX: Oscillator frequency or external clock input
39