TMP91C824
91C824-140
3.9.4
Operation in each mode
(1) Mode 0 (I/O Interface Mode)
This mode allows an increase in the number of I/O pins available for transmitting data to or
receiving data from an external shift register.
This mode includes the SCLK output mode to output synchronous clock SCLK and SCLK input
mode to input external synchronous clock SCLK.
Output extension
TMP91C824
TXD
SCLK
Port
Input extension
TC74HC595 or equivalent
TC74HC165 or equivalent
TMP91C824
A
B
C
D
E
F
G
H
RxD
SCLK
Port
Shift register
A
B
C
D
E
F
G
H
SI
SCK
RCK
QH
CLOCK
L
S/
Shift register
Figure 3.9.17 SCLK Output Mode connection example
TMP91C824
TXD
SCLK
Port
TMP91C824
A
B
C
D
E
F
G
H
RxD
SCLK
Port
Shift register
A
B
C
D
E
F
G
H
SI
SCK
RCK
QH
CLOCK
L
S/
External clock
Output extension
Input extension
TC74HC595 or equivalent
TC74HC165 or equivalent
External clock
Shift register
Figure 3.9.18 SCLK Input Mode Connection example