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TSC80251G2D

8/16-bit Microcontroller with Serial Communication Interfaces

Temic Semiconductors 

TSC80251G2D

Signal

Name

P1.0:7

P2.0:7

P3.0:7

PROG#

PSEN#

RD#

RST

RXD

SCL

SCK

SDA

SS#

T1:0

T2

T2EX

TXD

VDD

VPP

Type

I/O

I/O

I/O

I

O

O

I

I/O

I/O

I/O

I/O

I

I/O

I/O

I

O

PWR

I

Description

Alternate

Function

Port 1

P1 is an 8-bit bidirectional I/O port with internal pull-ups. P1 provides interrupt capability

for a keyboard interface.

Port 2

P2 is an 8-bit bidirectional I/O port with internal pull-ups.

A15:8

Port 3

P3 is an 8-bit bidirectional I/O port with internal pull-ups.

Programming Pulse input

The programming pulse is applied to this input for programming the on-chip EPROM/

OTPROM.

Program Store Enable/Read signal output

PSEN# is asserted for a memory address range that depends on bits RD0 and RD1 in

UCONFIG0 byte (see Table 13, Page 15).

Read or 17th Address Bit (A16)

P3.7

Read signal output to external data memory depending on the values of bits RD0 and RD1

in UCONFIG0 byte (see Table 13, Page 15).

Reset input to the chip

Holding this pin high for 64 oscillator periods while the oscillator is running resets the device.

The Port pins are driven to their reset conditions when a voltage greater than VIH1 is applied,

whether or not the oscillator is running.

This pin has an internal pull-down resistor which allows the device to be reset by connecting

a capacitor between this pin and VDD.

Asserting RST when the chip is in Idle mode or Power-Down mode returns the chip to normal

operation.

Receive Serial Data

P3.0

RXD sends and receives data in serial I/O mode 0 and receives data in serial I/O modes 1,

2 and 3.

I2C Serial Clock

P1.6

When I2C controller is in master mode, SCL outputs the serial clock to slave peripherals.

When I2C controller is in slave mode, SCL receives clock from the master controller.

SPI Serial Clock

P1.6

When SPI is in master mode, SCK outputs clock to the slave peripheral. When SPI is in

slave mode, SCK receives clock from the master controller.

I2C Serial Data

P1.7

SDA is the bidirectional I2C data line.

SPI Slave Select Input

P1.4

When in Slave mode, SS# enables the slave mode.

Timer 1:0 External Clock Inputs

When timer 1:0 operates as a counter, a falling edge on the T1:0 pin increments the count.

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.

Programming Supply Voltage

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

OTPROM.

Rev. A - May 7, 1999

7

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