SM59A16U1
8-Bit Micro-controller
64KB with ISP Flash
& 6K+256B RAM embedded
MAS = 0 is to use IICA1.
MAS = 1 is to use IICA2.
AB_EN: Arbitration lost enable bit. (Master mode only)
If set AB_EN bit, the hardware will check arbitration lost. Once arbitration lost occurred,
hardware will return to IDLE state. If this bit is cleared, hardware will not care arbitration lost
condition. Set this bit when multi-master and slave connection. Clear this bit when single
master to single slave.
BF_EN: Bus busy enable bit. (Master mode only)
If set BF_EN bit, hardware will not generate a start condition to bus until BF=0. Clear this bit
will always generate a start condition to bus when MStart is set. Set this bit when multi-master
and slave connection. Clear this bit when single master to single slave.
IICBR[2:0]: Baud rate selection (master mode only), where Fosc is the external crystal or oscillator
frequency. The default is Fosc/512 for users‟ convenience.
IICBR[2:0]
000
Baud rate
Fosc/32
001
Fosc/64
010
011
100
101
110
111
Fosc/128
Fosc/256
Fosc/512
Fosc/1024
Fosc/2048
Fosc/4096
14.2
IIC Status Register( IICS )
Mnemonic: IICS
Address: F8H
7
-
6
5
LAIF
4
3
TXIF
2
1
0
Reset
00H
MPIF
RXIF
RXAK
TxAK
RW or BB
MPIF: The Stop condition Interrupt Flag
The stop condition occurred and this bit will be set. Software need to clear this bit
LAIF: Arbitration lost bit. (Master mode only)
The Arbitration Interrupt Flag, the bus arbitration lost occurred and this bit will be set.
Software need to clear this bit
RxIF: The data Receive Interrupt Flag (RXIF) is set after the IICRWD (IIC Read Write Data
Buffer) is loaded with a newly receive data.
TxIF: The data Transmit Interrupt Flag (TXIF) is set when the data of the IICRWD (IIC Read
Write Data Buffer) is downloaded to the shift register.
RxAK: The Acknowledge Status indicate bit. When clear, it means an acknowledge signal has
been received after the complete 8 bits data transmit on the bus.
TxAK: The Acknowledge status transmit bit. When received complete 8 bits data, this bit will
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M071 Ver A SM59A16U1 04/12/2013
- 98 -
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
