NEC PD78F9488 - Manual (Page 217)

CHAPTER 12 SERIAL INTERFACE 1A0
User’s Manual U15331EJ4V1UD
217
12.2 Configuration of Serial Interface 1A0
Serial interface 1A0 includes the following hardware.
Table 12-1. Configuration of Serial Interface 1A0
Item Configuration
Registers Serial I/O shift register 1A0 (SIO1A0)
Automatic data transmit/receive address pointer 0 (ADTP0)
Control registers Serial operation mode register 1A0 (CSIM1A0)
Automatic data transmit/receive control register 0 (ADTC0)
Automatic data transmit/receive interval specification register 0 (ADTI0)
Port mode register 2 (PM2)
Port 2 (P2)
Figure 12-1. Block Diagram of Serial Interface 1A0
RE0 ARLD
0
TRF0
Internal bus
Automatic data
transmit/receive
control register 0
(ADTC0)
Serial operation
mode register 1A0
(CSIM1A0)
ADTI
07
ADTI
04
ADTI
03
ADTI
02
ADTI
01
ADTI
00
5-bit counter
Serial I/O shift
register 1A0
(SIO1A0)
Hand
shake
Serial clock
counter
Selector
SO10/
P24
PM24
P24 output
latch
DIR
10
DIR
10
Buffer RAM
Automatic data
transmit/receive
address pointer 0
(ADTP0)
PM23
TRF0
P23 output
latch
Match ADTI00 to ADTI04
INTCSI10
Clear
f SCK
SIO1A0 write
Q
R
S
Selector
ARLD0
CSIE
10
DIR
10
ATE0
SCL
101
SCL
100
ATE0
SI10/
P25
Automatic data
transmit/receive
interval specification
register 0 (ADTI0)
/2 2 f X /2 3 f X /2 4 f X
SCK10/
P23
LSCK
10
Selector
LSCK
10
CSIE10