Fujitsu FR81S User Manual
CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE
8. Operation of I2C
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : MULTI-FUNCTION SERIAL INTERFACE
FUJITSU SEMICONDUCTOR CONFIDENTIAL
361
Figure 8-38 Master Reception interrupt (2)-when FIFO is Disabled
(SSR:DMA="1", IBCR:WSEL="1", IBSR:RSA="0")
S Slave Address R ACK Data ACK Data ACK Data NACK P or Sr
□ □ □ □ △▲
① ② ② ③
S: Start condition
R: Data direction bit (Read direction)
P: Stop condition
Sr: Repeated start condition
: Interrupt because of INTE = "1"
: Interrupt because of CNDE = "1"
: Interrupt by TBIE= "1"
(1) Generation of interrupt by slave address transmission + direction bit transmission +
acknowledgment reception
- the data of the dummy is written in the TDR register.
(2) An interrupt generated by 1 byte reception
- the data of the dummy is written in the TDR register after reading reception data
(3) An interrupt generated by 1 byte reception
- Set ACKE= "0", MSS= "0" or MSS= "1", and SCC= "1" after reception data reading
*) Interrupt flag(INT,TBI) generated, TDRE bit is "1"
Figure 8-39 Master Reception interrupt (3)-when FIFO is Enabled
(SSR:DMA="1", IBCR:WSEL="0", IBCR:ACKE="0", IBSR:RSA="0")
S Slave Address R ACK Data ACK Data ACK Data NACK P or Sr
△▲
①
S: Start condition
R: Data direction bit (Read direction)
P: Stop condition
Sr: Repeated start condition
: Interrupt because of INTE = "1"
: Interrupt because of CNDE = "1"
(1) Generation of interrupt by TDRE ="1"
- Set MSS= "0" or MSS= "1", and SCC= "1" after reading all data from reception FIFO
Figure 8-40 Master Reception interrupt (4)-when FIFO is Enabled
(SSR:DMA="0", IBCR:WSEL="1", IBSR:RSA="0")
S Slave Address R ACK Data ACK Data ACK Data NACK P or Sr
□ ▲
①
S: Start condition
R: Data direction bit (Read direction)
P: Stop condition
Sr: Repeated start condition
: Interrupt because of CNDE = "1"
: Interrupt by TBIE= "1"
(1) Generation of interrupt by TDRE ="1"
- Set ACKE= "0", MSS= "0" or MSS= "1", and SCC= "1" after reading all data from reception FIFO
MB91520 Series
MN705-00010-1v0-E
1674