參數(shù)資料
型號(hào)： TMS370C042AN2L
元件分類： 8位微控制器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8位微控制器
文件頁(yè)數(shù)： 18/48頁(yè)
文件大小： 711K
代理商： TMS370C042AN2L
TMS370Cx36
8-BIT MICROCONTROLLER
SPNS039B – JANUARY 1996 – REVISED FEBRUARY 1997
18
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
digital port control registers
Peripheral file frame 2 contains the digital I/O pin configuration and control registers. Table 11 shows the specific
addresses, registers, and control bits within this peripheral file frame. Table 12 shows the port configuration
register setup.
Table 11. Peripheral File Frame 2: Digital Port-Control Registers
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ááááááááááááááááááááááááááááááááá
á
ááááááááááááááááááááááááááááááá
P02D
ááááááááááááááááááááááááááááááá
áááááááááááááááááááááááááááááá
áááááááááááááááááááá
áááá
áááá
á
DPORT2
áááá
áááá
ááááááááááááááááááááááááááááááááá
P021
Reserved
Port A Control Register 2 (must be 0)
APORT2
P023
ááááááááááááááááááááááááááááááááá
áá
P02B
Port A Direction
ADIR
áá
DPORT1
áááá
DDATA
á
P024
á
ááááááááááááááááááááááááááááááá
P02C
P02E
Port D Control Register 1 (must be 0)
Port D Control Register 2 (must be 0)
—
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—
—
—
—
—
Port D Data
—
—
—
P02F
Port D Direction
—
—
—
DDIR
Table 12. Port Configuration Register Setup
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á
ááááááááááááááááááááááááááááááá
D
á
á
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A
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c = Data
d = Direction
á
3 – 7
PORT
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0 – 7
á
Data out q
a = Port x Control Register 1
PIN
00q1
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Data out q
á
Data In y
00y0
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Data In y
á
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á
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serial peripheral interface
The SPI is a high-speed synchronous serial I/O port that allows a serial bit stream of programmed length (one
to eight bits) to be shifted into and out of the device at a programmable bit transfer rate. The SPI normally is
used for communications between the microcontroller and external peripherals or another microcontroller.
Typical applications include external I/O or peripheral expansion by way of devices such as shift registers,
display drivers, and A/D converters. Multi-device communications are supported by the master/slave operation
of the SPI. The SPI module features include the following:
Three external pins
–
SPISOMI: SPI slave output/master input pin or general-purpose bidirectional I/O pin
–
SPISIMO: SPI slave input/master output pin or general-purpose bidirectional I/O pin
–
SPICLK: SPI serial clock pin or general-purpose bidirectional I/O pin
Two operational modes: Master and slave
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