SM59R16A5/SM59R09A5/SM59R05A5
8-Bit Micro-controller
64KB/36KB/20KB with ISP Flash
& 2KB RAM embedded
14. IIC function
The IIC module uses the SCL (clock) and the SDA (data) line to communicate with external IIC interface. Its speed can be
selected to 400Kbps (maximum) by software setting the IICBR [2:0] control bit. The IIC module provided 2 interrupts
(RXIF, TXIF). It will generate START, repeated START and STOP signals automatically in master mode and can detects
START, repeated START and STOP signals in slave mode. The maximum communication length and the number of
devices that can be connected are limited by a maximum bus capacitance of 400pF.
The interrupt vector is 6Bh.
Mnemonic
Description
Direct
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RESET
IIC function
P4UR
1
P2PW
M
AUX
Auxiliary register
91h
BRGS
-
P4SPI
P4IIC
P0KBI
DPS
00H
IIC control
register
IIC status register
IIC Address 1
register
IIC Address 2
register
IIC Read/Write
register
IICCTL
IICS
F9h
F8h
FAh
IICEN
MSS
MAS
RDR
RStart
TDR
IICBR[2:0]
TXAK
04H
00H
A0H
MStart
RXIF
TXIF
RXAK
RW
MATCH1
or RW1
MATCH2
or RW2
IICA1
IICA1[7:1]
IICA2
IICRWD
IICS2
FBh
FCh
FDh
IICA2[7:1]
60H
00H
00H
IICRWD[7:0]
IIC status2
register
BF_E
N
-
-
-
-
AB_EN
AB_F
BF
Mnemonic: AUX
Address: 91h
7
6
-
5
4
3
2
1
0
DPS
Reset
00H
BRGS
P4SPI
P4UR1
P4IIC
P0KBI
P2PWM
P4IIC: P4IIC = 0 – IIC function on P1.
P4IIC = 1 – IIC function on P4.
Mnemonic: IICCTL
Address: F9h
7
6
5
4
3
2
1
0
Reset
IICEN
MSS
MAS
RStart
IICBR[2:0]
04h
IICEN: Enable IIC module
IICEN = 1 is Enable
IICEN = 0 is Disable.
MSS: Master or slave mode select.
MSS = 1 is master mode.
MSS = 0 is slave mode.
*The software must set this bit before setting others register.
MAS: Master address select (master mode only)
MAS = 0 is to use IICA1.
MAS = 1 is to use IICA2.
RStart: Re-start control bit (master mode only)
When this bit is set, the module will generate a start condition to the SDA and SCL lines (after
current ACK) and send out the calling address which is stored in the IICA1 or IICA2( selected by
MAS control bit).When module is finished to send out address, this bit will be cleared by
hardware.
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
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M047 60 Ver.G SM59R16A5 01/2014
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
