iic.md

IIC

IIC (Inter-Integrated Circuit / I²C) bus controller.

Registers

Name	Offset	Description
CON0	0x00	Control register 0
BUF	0x04	Data buffer
BAUD	0x08	Clock divider / Slave address
CON1	0x0C	Control register 1

CON0

Main control register.

Bits	R/W	Default	Name	Description
15	R	0	PND	Main interrupt status
14	W	0	PCLR	Clear the main interrupt
13	R	0	END_PND	Stop condition interrupt pending
12	W	0	END_PND_CLR	Clear a stop condition interrupt
11	R/W	0	/	/
10	R/W	0	END_PND_IE	Enable stop condition interrupt
9	R/W	0	IIC_ISEL	Input select (0: direct, 1: filtered)
8	R/W	0	IE	Interrupt enable
7	R	1	RD_ACK	Received ACK value (0: ACK, 1: NAK)
6	R/W	0	WR_ACK	ACK value to send (0: ACK, 1: NAK)
5	W	0	M_SET_RSTART	Send a (re-)Start condition before a transfer
4	W	0	M_SET_END	Send a Stop condition
3	R/W	0	DAT_DIR	Data transfer direction (0: send, 1: receive)
2	W	0	N_CFG_DONE	Execute the transfer
1	R/W	0	SLAVE	Mode (0: master, 1: slave)
0	R/W	0	EN	Enable

BUF

Data buffer.

Bits	R/W	Default	Description
15:8	/	/	/
7:0	R/W	/	Data buffer

BAUD

Clock divider or slave addres.

• Master mode:

Bits	R/W	Default	Description
15:8	/	/	/
7:0	W	/	Clock divider - Fiic = Fsys / ((BAUD + 1) * 2)

• Slave mode:

Bits	R/W	Default	Description
15:8	/	/	/
7:1	W	/	Slave address
0	W	/	/

CON1

Slave role related control/status.

Bits	R/W	Default	Name	Description
15	R	0	SPND	Start condition interrupt pending
14	W	0	SPND_CLR	Clear the start condition interrupt
13	R/W	0	SI_MODE	Slave addressing mode (0: match any address, 1: match the address in BAUD register)
12:0	R/W	0	/	/