HT46R068B/HT46R069B
Enhanced A/D Type 8-bit OTP MCU
● SIMC1 Register
Bit
Name
R/W
7
HCF
R
6
HAAS
R
5
HBB
R
4
3
TXAK
R/W
0
2
SRW
R
1
IAMWU
R/W
0
0
RXAK
R
HTX
R/W
0
POR
1
0
0
0
1
Bit 7
HCF: I2C Bus data transfer completion flag
0: Data is being transferred
1: Completion of an 8-bit data transfer
The HCF flag is the data transfer flag. This flag will be zero when data is being
transferred. Upon completion of an 8-bit data transfer the flag will go high and an
interrupt will be generated.
Bit 6
HAAS: I2C Bus address match flag
0: Not address match
1: Address match
The HASS flag is the address match flag. This flag is used to determine if the slave
device address is the same as the master transmit address. If the addresses match
then this bit will be high, if there is no match then the flag will be low.
Bit 5
HBB: I2C Bus busy flag
0: I2C Bus is not busy
1: I2C Bus is busy
The HBB flag is the I2C busy flag. This flag will be "1" when the I2C bus is busy
which will occur when a START signal is detected. The flag will be set to "0" when
the bus is free which will occur when a STOP signal is detected.
Bit 4
Bit 3
HTX: Select I2C slave device is transmitter or receiver
0: Slave device is the receiver
1: Slave device is the transmitter
TXAK: I2C Bus transmit acknowledge flag
0: Slave send acknowledge flag
1: Slave do not send acknowledge flag
The TXAK bit is the transmit acknowledge flag. After the slave device receipt of
8-bits of data, this bit will be transmitted to the bus on the 9th clock from the slave
device. The slave device must always set TXAK bit to "0" before further data is
received.
Bit 2
SRW: I2C Slave Read/Write flag
0: Slave device should be in receive mode
1: Slave device should be in transmit mode
The SRW flag is the I2C Slave Read/Write flag. This flag determines whether the
master device wishes to transmit or receive data from the I2C bus. When the trans-
mitted address and slave address is match, that is when the HAAS flag is set high,
the slave device will check the SRW flag to determine whether it should be in
transmit mode or receive mode. If the SRW flag is high, the master is requesting to
read data from the bus, so the slave device should be in transmit mode. When the
SRW flag is zero, the master will write data to the bus, therefore the slave device
should be in receive mode to read this data.
Rev. 1.00
90
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HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
