CHAPTER 14 SERIAL INTERFACE CHANNEL 1
258
User’s Manual U11302EJ4V0UM
Figure 14-1. Block Diagram of Serial Interface Channel 1
RE
ARLD
ERCE
ERR
TRF
STRB
BUSY
1
BUSY
0
Internal bus
Automatic data transmit/
receive control register
CSIE1
DIR
ATE
CSIM
11
CSIM
10
Serial operating mode
register 1
ADTI
7
ADTI
4
ADTI
3
Automatic data transmit/
receive interval specification
register
ADTI
2
ADTI
1
ADTI
0
5-bit counter
Serial I/O shift
register 1 (SIO1)
Hand-
shake
Serial clock
counter
Selector
SI1/P20
SO1/P21
PM21
STB/P23
PM23
P21 output latch
BUSY/P24
ATE
DIR
DIR
Buffer RAM
Automatic data
transmit/receive
address pointer
(ADTP)
SCK1/P22
PM22
Internal bus
ARLD
Q
R
S
P22 output latch
SIO1 write
Match
ADTI0 to ADTI4
Selector
Selector
TCL
37
TCL
36
TCL
35
TCL
34
4
TO2
Timer clock select
register 3
f
x
/2
2
to f
x
/2
9
Internal bus
INTCSI1
Clear