4500/720 Series 720 Family Models 4513, 4514 Group User's Manual

APPLICATION
2.4 Serial I/O
2-43
4513/4514 Group User’s Manual
Fig. 2.4.4 Serial I/O transfer timing
S IN
S OUT
Slave
S CK
SST instruction
S
OUT
S IN
S 0 S 7 ’S 1 S 2 S 3 S 4 S 5 S 6 S 7
SST instruction
Control signal
S 0
S 7 ’
S
1 S 3 S 4 S 5 S 6 S 7
M 0 M 7 ’
M
1 M 2
M 3 M 4 M 5 M 6 M 7
M 0 M 7 ’M 1 M 2 M 3 M 4 M 5 M 6 M 7
S 2
Master
M
0 –M 7 : the contents of master serial I/O register
S
0 –S 7 : the contents of slave serial I/O register
Rising of S
CK : serial input
Falling of S
CK : serial output
M
0 ’–M 7 ’: previous MSB contents of master and slave