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CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78014Y Subseries)
402
(3) Slave wait release (slave reception)
Slave wait release operation is performed by WREL flag (bit 2 of interrupt timing specification register (SINT))
setting or execution of a serial I/O shift register 0 (SIO0) write instruction.
When the slave receives a data, if the SCL line will immediately become high-impedance state by executing of
write instruction to the SIO0, 1st bit data from the master may not be received. This is because if SCL line is
being high-impedance state during execution of write instruction to the SIO0 (until next instruction execution),
SIO0 does not start the operation. Therefore receive the data by manipulating the P27 output latch using program
as shown in the Figure 16-49.
For these timings, see Figure 16-45.
Figure 16-49. Slave Wait Release (Reception)
Software operation
Serial transmission
Writing
FFH
to SIO0
Setting
ACKD
Setting
CSIIF0
Hardware operation
SCL
SDA0 (SDA1)
9
1
2
3
A0
W
ACK
D7
D6
D5
Software operation
Serial reception
P27
output
latch 0
ACK
output
Setting
CSIIF0
Hardware operation
Write
FFH
to SIO0
P27
output
latch 1
Wait
release
Transfer line
Master device operation
Slave device operation
Содержание 78014Y Series
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