HT46R068B/HT46R069B
Enhanced A/D Type 8-bit OTP MCU
Bit 1
IAMWU: I2C Address Match Wake-up Control
0: Disable
1: Enable
This bit should be set to "1" to enable I2C address match wake up from SLEEP or
IDLE Mode.
Bit 0
RXAK: I2C Bus Receive acknowledge flag
0: Slave receive acknowledge flag
1: Slave do not receive acknowledge flag
The RXAK flag is the receiver acknowledge flag. When the RXAK flag is "0", it
means that a acknowledge signal has been received at the 9th clock, after 8 bits of
data have been transmitted. When the slave device in the transmit mode, the slave
device checks the RXAK flag to determine if the master receiver wishes to receive
the next byte. The slave transmitter will therefore continue sending out data until
the RXAK flag is "1". When this occurs, the slave transmitter will release the SDA
line to allow the master to send a STOP signal to release the I2C Bus.
The SIMD register is used to store the data being transmitted and received. The same register is
used by both the SPI and I2C functions. Before the device writes data to the SPI bus, the actual
data to be transmitted must be placed in the SIMD register. After the data is received from the SPI
bus, the device can read it from the SIMD register. Any transmission or reception of data from the
SPI bus must be made via the SIMD register.
● SIMD Register
Bit
Name
R/W
7
D7
R/W
x
6
Dꢄ
R/W
x
5
D5
R/W
x
4
D4
R/W
x
3
D3
R/W
x
2
Dꢃ
R/W
x
1
D1
R/W
x
0
D0
R/W
x
POR
"x" ꢀnknown
● SIMA Register
Bit
Name
R/W
7
6
IICA5
R/W
x
5
IICA4
R/W
x
4
IICA3
R/W
x
3
IICAꢃ
R/W
x
2
IICA1
R/W
x
1
IICA0
R/W
x
0
IICAꢄ
R/W
x
—
—
—
POR
"x"ꢀnknown
Bit 7~1
IICA6~ IICA0: I2C slave address
IICA6~ IICA0 is the I2C slave address bit 6~ bit 0.
The SIMA register is also used by the SPI interface but has the name SIMC2. The
SIMA register is the location where the 7-bit slave address of the slave device is
stored. Bits 7~ 1 of the SIMA register define the device slave address. Bit 0 is not
defined.
When a master device, which is connected to the I2C bus, sends out an address,
which matches the slave address in the SIMA register, the slave device will be
selected. Note that the SIMA register is the same register address as SIMC2 which
is used by the SPI interface.
Bit 0
Undefined bit
This bit can be read or written by user software program.
Rev. 1.00
91
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HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
