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CHAPTER 17 SERIAL INTERFACE CHANNEL 1
420
(2) Communication operation
The 3-wire serial I/O mode is used for data transmission/reception in 8-bit units. Data transmission/reception
is carried out bit-wise in synchronization with the serial clock.
Shift operation of the serial I/O shift register 1 (SIO1) is carried out at the falling edge of the serial clock (SCK1).
The transmit data is held in the SO1 latch and is output from the SO1 pin. The receive data input to the SI1 pin
is latched into SIO1 at the rising edge of SCK1.
Upon termination of 8-bit transfer, the SIO1 operation stops automatically and the interrupt request flag (CSIIF1)
is set.
Figure 17-5. 3-Wire Serial I/O Mode Timings
Caution SO1 pin will be low by writing to SIO1.
SCK1
SI1
SO1
CSIIF1
1
2
3
4
5
7
6
8
DI7
DI6
DI5 DI3
DI2
DI1
DI0
DI4
DO7
DO6
DO5
DO4
DO3
DO2
DO1
DO0
Transfer start synchronizing with the falling edge of SCK1
End of Transfer
Write to SIO1
Содержание 78014Y Series
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