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HT56RB688 データシート(PDF) 73 Page - Holtek Semiconductor Inc

部品番号 HT56RB688
部品情報  TinyPowerTM A/D Type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces
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メーカー  HOLTEK [Holtek Semiconductor Inc]
ホームページ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT56RB688 データシート(HTML) 73 Page - Holtek Semiconductor Inc

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SIMn Control Register 1 - SIMnCTL1 (n=0 or 1) for I
2C Mode
Bit
76543210
Name
HCFn
HAASn
HBBn
HTXn
TXAKn
SRWn
¾
RXAKn
R/W
R/W
R/W
R/W
R/W
R/W
R/W
¾
R/W
POR
100000
¾
0
Bit 7
HCFn:I
2C Bus data transfer completion flag
0: Data is being transferred
1: Completion of an 8-bit data transfer
The HCFn 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
HAASn:I
2C Bus address match flag
0: No address match
1: Address match
The HAASn 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 address match, then the flag will be low.
Bit 5
HBBn:I
2C Bus busy flag
0: I
2C Bus is not busy
1: I
2C Bus is busy
The HBBn flag is the I
2C 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
HTXn: Select I
2C slave device is transmitter or receiver
0: Slave device is the receiver
1: Slave device is the transmitter
Bit 3
TXAKn:I
2C Bus transmit acknowledge flag
0: Slave sends acknowledge flag
1: Slave does not send acknowledge flag
The TXAKn bit is the transmit acknowledge flag. After the slave device receipt of 8-bit of data,
this bit will be transmitted to the bus on the 9th clock from the slave device. The slave device
must always set TXAKn bit to 0 before further data is received.
Bit 2
SRWn:I
2C Slave Read/Write flag
0: Slave device should be in receive mode
1: Slave device should be in transmit mode
The SRWn flag is the I
2C Slave Read/Write flag. This flag determines whether the master device
wishes to transmit or receive data to or from the I
2C bus. When the transmitted address and
slave address is match, that is when the HAASn flag is set high, the slave device will check the
SRWn flag to determine whether it should be in transmit mode or receive mode. If the SRWn flag
is high, the master is requesting to read data from the bus, so the slave device should be in
transmit mode. When the SRWn flag is zero, the master will write data to the bus, therefore the
slave device should be in receive mode to read this data.
Bit 1
unimplemented, read as
²0²
Bit 0
RXAKn:I
2C Bus Receive acknowledge flag
0: Slave receives acknowledge flag
1: Slave does not receive acknowledge flag
The RXAKn flag is the receiver acknowledge flag. When the RXAKn 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 RXAKn flag
to determine if the master receiver wishes to receive the next byte. The slave transmitter will
therefore continue sending out data until the RXAKn flag is 1. When this occurs, the slave
transmitter will release the SDAn line to allow the master to send a STOP signal to release the
I
2C Bus.
HT56RB688
TinyPowerTM A/D type Smart Card OTP MCU
with LCD, DAC, ISO 7816 and USB Interfaces
Rev. 1.10
73
April 15, 2013


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