TMP91C824
91C824-173
#
Shift
edge
Data is transmitted on the leading edge of the clock and received on the trailing edge.
Leading edge shift
Data is shifted on the leading edge of the serial clock (on the falling edge of the SCK pin
input/output).
Trailing edge shift
Data is shifted on the trailing edge of the serial clock (on the rising edge of the SCK pin
input/output).
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
76543210
*
7654321
**
765432
***
76543
****
7654
*****
765
******
76
******
7
SO pin output
6543210
*
543210
**
0
*******
10
******
210
*****
3210
****
43210
***
********
76543210
SCK pin output
Shift register
SCK pin
SI pin
Shift register
(a) Leading edge
(b) Trailing edge
Note:
*
= Don’t care
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
Figure 3.10.25
Shift edge