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TSC80251-SK

Extended 8–bit Microcontroller with Serial Communication Interfaces

Temic Semiconductors 

TSC87251G1A

Signal

Name

T2

T2EX

TXD

VDD

VSS

VSS1

VSS2

VPP

WR#

XTAL1

XTAL2

Type

I/O

I

I/O

PWR

GND

GND

GND

I

O

I

O

Description

Alternate

Function

Timer 2 Clock Input/Output

P1.0

For the timer 2 capture mode, T2 is the external clock input. For the Timer 2 clock–out mode,

T2 is the clock output.

Timer 2 External Input

P1.1

In timer 2 capture mode, a falling edge initiates a capture of the timer 2 registers. In auto–reload

mode, a falling edge causes the timer 2 register to be reloaded. In the up–down counter mode,

this signal determines the count direction: 1= up, 0= down.

Transmit Serial Data

P3.1

TXD outputs the shift clock in serial I/O mode 0 and transmits data in serial I/O modes 1, 2 and 3.

Digital Supply Voltage

Connect this pin to +5V or +3V supply voltage.

Circuit Ground

Connect this pin to ground.

Secondary Ground 1

This ground is provided to reduce ground bounce and improve power supply bypassing. Con-

nection of this pin to ground is recommended. However, when using the TSC87251G1A as a

pin–for–pin replacement for a 8xC51 product, VSS1 can be unconnected without loss of com-

patibility.

Not available on DIP package.

Secondary Ground 2

This ground is provided to reduce ground bounce and improve power supply bypassing. Con-

nection of this pin to ground is recommended. However, when using the TSC87251G1A as a

pin–for–pin replacement for a 8xC51 product, VSS2 can be unconnected without loss of com-

patibility.

Not available on DIP package.

Programming Supply Voltage

The programming supply voltage is applied to this input for programming the on–chip EPROM/

OTPROM

Write

P3.6

Write signal output to external memory.

Input to the on–chip inverting oscillator amplifier

To use the internal oscillator, a crystal/resonator circuit is connected to this pin. If an external

oscillator is used, its output is connected to this pin. XTAL1 is the clock source for internal tim-

ing.

Output of the on–chip inverting oscillator amplifier

To use the internal oscillator, a crystal/resonator circuit is connected to this pin. If an external

oscillator is used, leave XTAL2 unconnected.

Note:

1. The description of A15:8/P2.7:0 and AD7:0/P0.7:0 are for the non–page mode chip configuration. If the chip is configured in page mode

operation, port 0 carries the lower address bits (A7:0) while port 2 carries the upper address bits (A15:8) and the data (D7:0).

Rev. A – September 21, 1998

7

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