Serial Interface Channel 1 Block Diagram - NEC PD78052 User Manual

Internal Bus
Buffer RAM
ATE
DIR
Serial I/O
SI1/
Shift Register 1
P20
(SIO1)
PM21
SO1/
P21 Output
P21
Latch
PM23
STB/
Hand-
P23
BUSY/
P24
SCK1/
P22
P22 Output Latch
PM22
CHAPTER 18 SERIAL INTERFACE CHANNEL 1
Figure 18-1. Serial Interface Channel 1 Block Diagram
Automatic Data
Transmit/Receive
Address Pointer
(ADTP)
Internal Bus
Automatic Data
Transmit/Receive Interval
Specify Register
DIR
ADTI ADTI ADTI ADTI ADTI
7 4 3 2 1
ADTI0-ADTI4
Match
5-Bit Counter
shake
ARLD
Serial Clock
Counter
SIOI write
Clear
R
Q
S
Automatic Data
Transmit/Receive
Control Register
ADTI
TRF STRB BUSY
RE ARLD ERCE ERR
0
Selector
Serial Operating
Mode Register 1
CSIE1 DIR ATE CSIM CSIM
BUSY
1 0 11 10
TRF
Selector
INTCSI1
Selector
f /2–f /2 8
xx xx
TO2
4
TCL TCL TCL TCL
37 36 35 34
Timer Clock
Select Register 3
Internal Bus
395