2C Master Interface The 73S1210F includes a dedic" />
參數(shù)資料
型號: 73S1210F-44IM/F/P
廠商: Maxim Integrated Products
文件頁數(shù): 77/126頁
文件大?。?/td> 0K
描述: IC SMART CARD READER PROG 44-QFN
產(chǎn)品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 260
系列: 73S12xx
核心處理器: 80515
芯體尺寸: 8-位
速度: 24MHz
連通性: I²C,智能卡,UART/USART
外圍設備: LED,POR,WDT
輸入/輸出數(shù): 8
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 6.5 V
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-VFQFN 裸露焊盤
包裝: 管件
73S1210F Data Sheet
DS_1210F_001
54
Rev. 1.4
1.7.12 I
2C Master Interface
The 73S1210F includes a dedicated fast mode, 400kHz I
2C Master interface. The I2C interface can read
or write 1 or 2 bytes of data per data transfer frame. The MPU communicates with the interface through
six dedicated SFR registers:
Device Address (DAR)
Write Data (WDR)
Secondary Write Data (SWDR)
Read Data (RDR)
Secondary Read Data (SRDR)
Control and Status (CSR)
The DAR register is used to set up the slave address and specify if the transaction is a read or write
operation. The CSR register sets up, starts the transaction and reports any errors that may occur. When
the I
2C transaction is complete, the I2C interrupt is reported via external interrupt 6. The I2C interrupt is
automatically de-asserted when a subsequent I
2C transaction is started. The I2C interface uses a 400kHz
clock from the time-base circuits.
1.7.12.1
I
2C Write Sequence
To write data on the I
2C Master Bus, the 80515 has to program the following registers according to the
following sequence:
1.
Write slave device address to Device Address register (DAR). The data contains 7 bits for the slave
device address and 1 bit of op-code. The op-code bit should be written with a 0 to indicate a write
operation.
2.
Write data to Write Data register (WDR). This data will be transferred to the slave device.
3.
If writing 2 bytes, set bit 0 of the Control and Status register (CSR) and load the second data byte to
Secondary Write Data register (SWDR).
4.
Set bit 1 of the CSR register to start I
2C Master Bus.
5.
Wait for I
2C interrupt to be asserted. It indicates that the write on I2C Master Bus is done. Refer to
information about the INT6Ctl, IEN1 and IRCON register for masking and flag operation.
Figure 10 shows the timing of the I
2C write mode:
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