參數(shù)資料
型號(hào)： TSC2302IRGZ
元件分類： Codec
英文描述： PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC
中文描述： 可編程觸摸屏控制器，立體聲編解碼器
文件頁(yè)數(shù)： 19/81頁(yè)
文件大小： 1211K
代理商： TSC2302IRGZ
www.ti.com
www.ti.com
TSC2302
SLAS394–JULY 2003
DIGITAL INTERFACE
The TSC2302 communicates through a standard SPI bus. The SPI allows full-duplex, synchronous, serial
communication between a host processor (the master) and peripheral devices (slaves). The SPI master
generates the synchronizing clock and initiates transmissions. The SPI slave devices depend on a master to start
and synchronize transmissions.
A transmission begins when initiated by an SPI master. The byte from the SPI master begins shifting in on the
slave MOSI pin under the control of the master serial clock. As the byte shifts in on the MOSI pin, a byte shifts
out on the MISO pin to the master shift register.
When the POL pin of the TSC2302 is tied high (POL=1), the idle state of the serial clock for the TSC2302 is low,
which corresponds to a clock polarity setting of 0 (typical microprocessor SPI control bit CPOL = 0). When the
POL pin of the TSC2302 is tied low (POL=0), the idle state of the serial clock is high, which corresponds to a
clock polarity setting of 1 (typical microprocessor SPI control bit CPOL = 1). The TSC2302 interface is designed
so that with a clock phase bit setting of 1 (typical microprocessor SPI control bit CPHA = 1), the master begins
driving its MOSI pin and the slave begins driving its MISO pin on the first serial clock edge. The SS pin can
remain low between transmissions; however, the TSC2302 only interprets the first 16 bits transmitted after the
falling edge of SS as a command word, and the next 16 bits as a data word only if writing to a register. Reserved
register bits should be written to their default values (see Table 3).
TSC2302 Communication Protocol
The TSC2302 is entirely controlled by registers. Reading and writing these registers is accomplished by the use
of a 16-bit command, which is sent prior to the data for that register. The command is constructed as shown in
the TSC2302 command word bit register.
The command word begins with an R/W bit, which specifies the direction of data flow on the serial bus. The
following 4 bits specify the page of memory this command is directed to, as shown in Table 1. The next six bits
specify the register address on that page of memory to which the data is directed. The last five bits are reserved
for future use.
Table 1. Page Addressing
PG3
PG2
PG1
PG0
PAGE ADDRESSED
0
0
0
0
0
0
0
0
1
1
0
0
1
0
2
0
0
1
1
reserved
0
1
0
0
reserved
0
1
0
1
reserved
0
1
1
0
reserved
0
1
1
1
reserved
1
0
0
0
reserved
1
0
0
1
reserved
1
0
1
0
reserved
1
0
1
1
reserved
1
1
0
0
reserved
1
1
0
1
reserved
1
1
1
0
reserved
1
1
1
1
reserved
19
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