CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ4V0UM
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When the local address is received, an ACK signal is automatically output in synchronization with the falling
edge of the SCLn’s eighth clock regardless of the ACKEn value. No ACK signal is output if the received
address is not a local address (n = 0, 1).
The ACK signal output method during data reception is based on the wait timing setting, as described below.
When 8-clock wait is selected: ACK signal is output at the falling edge of the SCLn’s eighth clock if ACKEn is
set to 1 before wait cancellation.
When 9-clock wait is selected: ACK signal is automatically output at the falling edge of the SCLn’s eighth clock
if ACKEn has already been set to 1.
(5)
Stop condition
When the SCLn pin is at high level, changing the SDAn pin from low level to high level generates a stop
condition (n = 0, 1).
A stop condition is a signal that the master device outputs to the slave device when serial transfer has been
completed. The slave device includes hardware that detects stop conditions.
Figure 10-22. Stop Condition
H
SCL
SDA
Remark
n = 0, 1
A stop condition is generated when bit 0 (SPTn) of IIC control register n (IICCn) is set to 1. When the stop
condition is detected, bit 0 (SPDn) of IIC status register n (IICSn) is set to 1 and INTIICn is generated when bit 4
(SPIEn) of IICCn is set to 1 (n = 0, 1).
Содержание MPD703030A
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