CM6533DH datasheet(38/60 Pages) CMEDIA

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CM6533,CM6533N,CM6533X1,CM6533DH

USB Audio Chip

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Rev.1.6

6.8.11

I2C Slave Mode

“7-bit slave address = 7’b0001000 to 7’b0001011”

CM6533/CM6533N/CM6533X1/CM6533DH can serves as a slave device with bit rate up to 400Kbps (fast mode).

External MCU can write data to CM6533/CM6533N/CM6533X1/CM6533DH or read data from

CM6533/CM6533N/CM6533X1/CM6533DH (No Size limitation in I2C Interface). Since host side and MCU can both

access to all the internal registers.

CM6533/CM6533N/CM6533X1/CM6533DH will transfer an interrupt to internal MCU until the INT bit of I2C

control Register have been clean by internal MCU. The interrupt will be trigger when write transaction done or

detect read-slave-address.

The main usage of 2-wire slave bus is to become the interface between the

CM6533/CM6533N/CM6533X1/CM6533DH and a external micro control unit (EMCU).

6.8.12

I2C Slave Data Register

Address: 30~33h

Bits

R/W

Bit Mnemonic

Description

Default

31:0

R/W

MCU_data0~F

The data received from or transmitted to master device.

This register cannot be written when 2-wire slave serial

bus status is busy.

0000h

(POR)

6.8.13

I2C Slave Status Register

Address: 34~35h

Bits

R/W

Bit Mnemonic

Description

Default

Reserved

14:12

Reserved

R/W

Thld_int_mask

Threshold interrupt mask:

1: mask; 0: non-mask ; default :0

(POR)

Write_data_ready Interrupt happened, auto-cleared after read

(POR)

R/W

I2c_s_reset

0: 2-wire serial bus in normal operation (default)

1: 2-wire serial bus in reset state

(POR)

R/W

Dri_tran_st

initiated transaction status

1: The last initiated transaction failed, write 1 to clear.

(POR)

R/W

Rd_tran_st

Read transaction status

1: a new read transaction received, write 1 to clear.

(POR)

R/W

Wr_tran_st

Write transaction status

1: a new write transaction received, write 1 to clear.

(POR)

5:1

Data_len

The data length of the last write transaction received,

00000: 1 byte (MAP only)

00001: 2 byte (MAP + 1 byte data)

00010: 3 byte (MAP + 2 byte data)

00011: 4 byte (MAP + 3 byte data)

00100: 5 byte (MAP + 4 byte data)



01111: 16 byte (MAP + 15 byte data)

10000: 17 byte (MAP + 16 byte data)

(POR)

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