CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ4V0UM
298
Notes 1.
When WTIMn (bit 3 of the IIC control register n (IICCn)) = 1, an interrupt request occurs at the falling
edge of the ninth clock. When WTIMn = 0 and the extension code’s slave address is received, an
interrupt request occurs at the falling edge of the eighth clock (n = 0, 1).
2.
When there is a possibility that arbitration will occur, set SPIEn = 1 for master device operation (n = 0,
1).
Remark
SPIEn: Bit 5 of IIC control register n (IICCn)
10.3.11 Wake up function
The I
2
C bus slave function is a function that generates an interrupt request (INTIICn) when a local address and
extension code have been received.
This function makes processing more efficient by preventing unnecessary interrupt requests from occurring when
addresses do not match.
When a start condition is detected, wake-up standby mode is set. This wake-up standby mode is in effect while
addresses are transmitted due to the possibility that an arbitration loss may change the master device (which has
output a start condition) to a slave device.
However, when a stop condition is detected, bit 5 (SPIEn) of IIC control register n (IICCn) is set regardless of the
wake up function, and this determines whether interrupt requests are enabled or disabled (n = 0, 1).
Содержание MPD703030A
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