Electronics America 8-Bit Single-Chip Microcontrollers User's Manual

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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 ( µ PD78054 Subseries)
Figure 16-2. Serial Interface Channel 0 Block Diagram
Remark Output Control performs selection between CMOS output and N-ch open-drain output.
CSIE0 COI WUP
CSIM
04
CSIM
03
CSIM
02
CSIM
01
CSIM
00
Serial Operating Mode Register 0
Control
Circuit
Output
Control
Selector
SI0/SB0/
P25
PM25
Output
Control
SO0/SB1/
P26
PM26
Output
Control
SCK0/
P27
PM27
Selector
P25
Output Latch
P26 Output Latch
CLD
P27
Output Latch
Internal Bus
BSYE ACKD ACKE ACKT CMDD RELD CMDT RELT
Internal Bus
Bus Release/
Command/
Acknowledge
Detector
Serial Clock
Counter
Serial Clock
Control Circuit
CLR
D
SET
Q
Match
Busy/
Acknowledge
Output Circuit
Interrupt
Request
Signal
Generator
ACKD
CMDD
RELD
WUP
Selector
Selector
TCL33 TCL32 TCL31 TCL30
4
Timer Clock
Select
Register 3
f xx /2-f xx /2
8
INTCSI0
CLD SIC SVAM
CSIM01
CSIM00
CSIM01
CSIM00
Slave Address
Register (SVA)
SVAM
Serial Bus Interface
Control Register
Serial I/O Shift
Register 0 (SIO0)
TO2
Interrupt Timing
Specify Register