CHAPTER 12 SERIAL INTERFACE 20
User’s Manual U15075EJ2V1UD
250
Figure 12-11. 3-Wire Serial I/O Mode Timing (7/7)
(xii) Slave operation (when DAP20 = 1, CKP20 = 1, SSE20 = 1)
1
2
3
4
5
6
7
8
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
DO7
DO6
DO5
DO4
DO3
DO2
DO1
DO0
Note 2
SCK20
SI20
Note 1
SO20
Hi-Z
Hi-Z
SS20
SIO20
write
INTCSI20
Notes 1.
The value of the last bit previously output is output.
2.
DO0 is output until SS20 rises.
When SS20 is high, SO20 is in a high-impedance state.
(3) Transfer
start
Serial transfer is started by setting transfer data to the transmission shift register (TXS20/SIO20) when the
following two conditions are satisfied.
•
Bit 7 (CSIE20) of serial operation mode register 20 (CSIM20) = 1
•
Internal serial clock is stopped or SCK20 is high after 8-bit serial transfer.
Caution If CSIE20 is set to “1” after data is written to TXS20/SIO20, transfer does not start.
Termination of 8-bit transfer stops the serial transfer automatically and generates the interrupt request signal
(INTCSI20).
Содержание U789436 Series
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