HT56RB688_13 datasheet(73/164 Pages) HOLTEK

73 / 164 page

SIMn Control Register 1 - SIMnCTL1 (n=0 or 1) for I

2C Mode

Bit

76543210

Name

HCFn

HAASn

HBBn

HTXn

TXAKn

SRWn

RXAKn

R/W

POR

100000

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

2C Bus.

HT56RB688

TinyPowerTM A/D type Smart Card OTP MCU

with LCD, DAC, ISO 7816 and USB Interfaces

Rev. 1.10

April 15, 2013

HT56RB688 Datasheet(PDF) 73 Page - Holtek Semiconductor Inc

HT56RB688 Datasheet(HTML) 73 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL