
CHAPTER 14 SERIAL INTERFACE IICA
User’s Manual U19678EJ1V1UD
800
14.5.15 Cautions
(1) When STCEN = 0
Immediately after I
2C operation is enabled (IICBSY = 1), the bus communication status (IICBSY = 1) is
recognized regardless of the actual bus status. When changing from a mode in which no stop condition has
been detected to a master device communication mode, first generate a stop condition to release the bus, then
perform master device communication.
When using multiple masters, it is not possible to perform master device communication when the bus has not
been released (when a stop condition has not been detected).
Use the following sequence for generating a stop condition.
<1> Set IICA control register 1 (IICCTL1).
<2> Set bit 7 (IICE) of IICA control register 0 (IICCTL0) to 1.
<3> Set bit 0 (SPT) of IICCTL0 to 1.
(2) When STCEN = 1
Immediately after I
2C operation is enabled (IICE= 1), the bus released status (IICBSY = 0) is recognized
regardless of the actual bus status. To generate the first start condition (STT = 1), it is necessary to confirm
that the bus has been released, so as to not disturb other communications.
(3) If other I
2C communications are already in progress
If I
2C operation is enabled and the device participates in communication already in progress when the SDA0
pin is low and the SCL0 pin is high, the macro of I
2C recognizes that the SDA0 pin has gone low (detects a
start condition). If the value on the bus at this time can be recognized as an extension code, ACK is returned,
but this interferes with other I
2C communications. To avoid this, start I2C in the following sequence.
<1> Clear bit 4 (SPIE) of IICCTL0 to 0 to disable generation of an interrupt request signal (INTIICA) when the
stop condition is detected.
<2> Set bit 7 (IICE) of IICCTL0 to 1 to enable the operation of I
2C.
<3> Wait for detection of the start condition.
<4> Set bit 6 (LREL) of IICCTL0 to 1 before ACK is returned (4 to 80 clocks after setting IICE to 1), to forcibly
disable detection.
(4) Setting STT and SPT (bits 1 and 0 of IICCTL0) again after they are set and before they are cleared to 0 is
prohibited.
(5) When transmission is reserved, set SPIE (bit 4 of IICCTL0) to 1 so that an interrupt request is generated when
the stop condition is detected. Transfer is started when communication data is written to IICA after the interrupt
request is generated. Unless the interrupt is generated when the stop condition is detected, the device stops
in the wait state because the interrupt request is not generated when communication is started. However, it is
not necessary to set SPIE to 1 when MSTS (bit 7 of IICS) is detected by software.