Allwinner A20 - Page 583

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 583 / 812
6.2.4.5. TWI STATUS REGISTER
Offset: 0x10
Register Name: TWI_STAT
Default Value: 0x0000_00F8
Bit
Read/Write
Default
Description
31:8
/
/
/
7:0
R
0xF8
STA
Status Information Byte
Code Status
0x00: Bus error
0x08: START condition transmitted
0x10: Repeated START condition transmitted
0x18: Address + Write bit transmitted, ACK received
0x20: Address + Write bit transmitted, ACK not received
0x28: Data byte transmitted in master mode, ACK received
0x30: Data byte transmitted in master mode, ACK not received
0x38: Arbitration lost in address or data byte
0x40: Address + Read bit transmitted, ACK received
0x48: Address + Read bit transmitted, ACK not received
0x50: Data byte received in master mode, ACK transmitted
0x58: Data byte received in master mode, not ACK transmitted
0x60: Slave address + Write bit received, ACK transmitted
0x68: Arbitration lost in address as master, slave address +
Write bit received, ACK transmitted
0x70: General Call address received, ACK transmitted
0x78: Arbitration lost in address as master, General Call
address received, ACK transmitted
0x80: Data byte received after slave address received, ACK
transmitted
0x88: Data byte received after slave address received, not ACK
transmitted
0x90: Data byte received after General Call received, ACK
transmitted
0x98: Data byte received after General Call received, not ACK
transmitted
0xA0: STOP or repeated START condition received in slave
mode
0xA8: Slave address + Read bit received, ACK transmitted
0xB0: Arbitration lost in address as master, slave address +
Read bit received, ACK transmitted
0xB8: Data byte transmitted in slave mode, ACK received
0xC0: Data byte transmitted in slave mode, ACK not received