TMP88CU74F datasheet(87/132 Pages) TOSHIBA

87 / 132 page

TMP88CU74

2003-02-17

88CU74-87

(6) Transmitter/Receiver selection

Set the TRX (bit 6 in SBICR2) to “1” for operating the TMP88CU74 as a transmitter.

Reset the TRX for operation as a receiver. When data with an addressing format is

transferred in the slave mode, the TRX is set to “1” if the direction bit (R/ W ) sent from

the master device is “1”, and is cleared to “0” if the bit is “0”. In the master mode, after

an acknowledge signal is returned from the slave device with the hardware, the TRX is

set to “0” if a transmitted direction bit is “1”, and set to “1” if it is “0”. When an

acknowledge signal is not returned, the current condition is maintained.

The TRX is cleared to “0” by the hardware after a stop condition on the bus is

detected or arbitration is lost.

The following table shows TRX changing conditions and TRX value after changing.

Mode

Direction Bit

Conditions

TRX after

Changing

Slave mode

When the received slave address is the

same as I

2CAR

Master mode

When the ACK signal is returned

When the serial bus interface circuit is used with a free data format, the TRX is not

changed by hardware since the slave address and the direction bit are not recognized,

and they are processed as data from immediately after start condition.

(7) Start/Stop condition generation

A start condition and 8-bit data are output on the bus by writing “1” to the MST, TRX

and BB when the BB (bit 5 in SBICR2) is “0”. It is necessary to set the transmitting

data to the data buffer register and “1” to ACK beforehand.

Figure 2.10.7 Start Condition Generation and Slave Address Generation

When the BB is “1”, sequence of generating a stop condition is started by writing “1”

to the MST, TRX, and PIN, and “0” to the BB. Do not modify the contents of MST, TRX,

BB and PIN until a stop condition is generated on a bus.

Figure 2.10.8 Stop Condition Generation

SCL pin

SDA pin

Start condition

slave address and the direction bit

Acknowledge signal

R/W

SDA pin

SCL pin

Stop condition

2007-10-19

TMP88CU74F bảng dữ liệu(PDF) 87 Page - Toshiba Semiconductor

TMP88CU74F bảng dữ liệu(HTML) 87 Page - Toshiba Semiconductor

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

bảng dữ liệu tải về

Link URL