EDSTRG28PLCCCX datasheet(18/78 Pages) TI

18 / 78 page

TMS370 MAJOR COMPONENTS ARCHITECTURE

1–10

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• HOUSTON, TEXAS 77251–1443

serial communications interface (SCI1 or SCI2)

The term SCI is used frequently to refer to SCI1 and SCI2. The SCI1 and SCI2 modules are built-in serial

interfaces. The SCI1 has a 3-pin configuration and SCI2 has a 2-pin configuration. Both offer the following

features:

D Programmable to be asynchronous (up to 156 Kbps)

D Full duplex, double-buffered receive (Rx) and transmit (Tx)

D Programmable format with error-checking capabilities

The following feature is available only on the SCI1 module:

D Programmable to be isosynchronous (up to 2.5 Mbps)

The SCI1 and SCI2 modules program and control all timing, data format, and protocol factors. The CPU takes

part in the serial communications only:

D To write data transmitted to the registers in the SCI

D To read received data from the registers in the SCI when interrupted

serial peripheral interface (SPI)

The SPI module is a built-in serial interface that facilitates communication between the network master, slave

CPUs, and the external peripheral devices. The SPI module provides synchronous data transmission of up to

2.5 Mbps. Like the SCI, the SPI is set up by software. Once setup, the CPU takes no part in timing, data format,

or protocol. Also, like the SCI, the CPU reads and writes to memory-mapped registers to receive and transmit

data. An SPI interrupt alerts the CPU when received data is ready.

analog-to-digital converter (ADC1, ADC2, ADC3) modules

The 8-bit ADC modules perform successive approximation conversion. The term ADC is a general term used

for ADC1, ADC2, and ADC3 modules. The ADCs offer the following number of input channels for each of the

specified microcontroller families:

D ADC1 offers the following:

–

Four channels in the 40-pin devices of the ’x4x subfamily,

–

Eight channels in the 44-pin devices of the ’x4x, ’x32, and ’x36 subfamilies

–

Eight channels in the 64-pin and 68-pin devices of the ’x5x, ’x6x, ’x7x, and ’xBx subfamilies

D ADC2 offers four channels in the 28-pin devices of the ’xCx subfamily

D ADC3 offers 15 channels in the 40-pin and 44-pin devices of the ’x9x subfamily

The reference source and input channel are selectable. The user can program the conversion result to be the

ratio of the input voltage to the reference voltage or the ratio of one analog input to another. Input lines that are

not required for analog-to-digital conversion can be programmed to be digital input lines.

For a detailed explanation on any of the major components of the TMS370 device family, see the

TMS370 8-Bit

Microcontroller User’s Guide (literature number SPNU127) or to the specific subfamily data sheet.

For more details on the programming of the TMS370 family or for further expansion on the applications of these

devices, see the paragraph in this section on related documentation from Texas Instruments.

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