UPD78320 Datasheet, PDF (40/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

Figure 3-7. Block Diagram of Clocked Serial Interface
8
CSIM
MOD2 CTXE CRXE WUP MOD1 CLS1 CLS0 MOD0
Internal Bus
SI/SB1
SO/SB0
N-ch Open-Drain
Output Enable
SCK
Shift Register SIO
Bus Release/
Command/Acknowledge
Detector
Serial Clock
Counter
Serial Clock
Controller
8
SBIC
RELT CMDT RELD CMDD ACKT ACKE ACKD BSYE
SET
CLEAR
SO Latch
DQ
Busy/
Acknowledge
Detector
Interrupt
Signal
Generation
Controller
INTCSI
MPX
Baud Rate Generator
Output
fCLK/8
fCLK/32
CLS1 CLS0