AS80C154-L16 datasheet(4/24 Pages) TEMIC

4 / 24 page

80C154/83C154

Rev.F (14 Jan. 97)

MATRA MHS

Pin Description

Vss

Circuit Ground Potential.

VCC

Supply voltage during normal, Idle, and Power Down

operation.

Port 0

Port 0 is an 8 bit open drain bi-directional I/O port. Port 0

pins that have 1’s written to them float, and in that state

can be used as high-impedance inputs.

Port 0 is also the multiplexed low-order address and data

bus during accesses to external Program and Data

Memory. In this application it uses strong internal pullups

when emitting 1’s. Port 0 also outputs the code bytes

during program verification in the 83C154. External

pullups are required during program verification. Port 0

can sink eight LS TTL inputs.

Port 1

Port 1 is an 8 bit bi-directional I/O port with internal

pullups. Port 1 pins that have 1’s written to them are

pulled high by the internal pullups, and in that state can

be used as inputs. As inputs, Port 1 pins that are externally

being pulled low will source current (IIL, on the data

sheet) because of the internal pullups.

Port 1 also receives the low-order address byte during

program verification. In the 83C154, Port 1 can sink or

source three LS TTL inputs. It can drive CMOS inputs

without external pullups.

2 inputs of PORT 1 are also used for timer/counter 2 :

P1.0 [T2] : External clock input for timer/counter 2. P1.1

[T2EX] : A trigger input for timer/counter 2, to be

reloaded or captured causing the timer/counter 2

interrupt.

Port 2

Port 2 is an 8 bit bi-directional I/O port with internal

pullups. Port 2 pins that have 1’s written to them are

pulled high by the internal pullups, and in that state can

be used as inputs. As inputs, Port 2 pins that are externally

being pulled low will source current (ILL, on the data

sheet) because of the internal pullups. Port 2 emits the

high-order address byte during fetches from external

Program Memory and during accesses to external Data

Memory that use 16 bit addresses (MOVX @DPTR). In

this application, it uses strong internal pullups when

emitting 1’s. During accesses to external Data Memory

that use 8 bit addresses (MOVX @Ri), Port 2 emits the

contents of the P2 Special Function Register.

It also receives the high-order address bits and control

signals during program verification in the 83C154. Port

2 can sink or source three LS TTL inputs. It can drive

CMOS inputs without external pullups.

Port 3

Port 3 is an 8 bit bi-directional I/O port with internal

pullups. Port 3 pins that have 1’s written to them are

pulled high by the internal pullups, and in that state can

be used as inputs. As inputs, Port 3 pins that are externally

being pulled low will source current (ILL, on the data

sheet) because of the pullups. It also serves the functions

of various special features of the TEMIC 51 Family, as

listed below.

Port Pin

Alternate Function

P3.0

P3.1

P3.2

P3.3

P3.4

P3.5

P3.6

P3.7

RXD (serial input port)

TXD (serial output port)

INT0 (external interrupt 0)

INT1 (external interrupt 1)

TD (Timer 0 external input)

T1 (Timer 1 external input)

WR (external Data Memory write strobe)

RD (external Data Memory read strobe)

Port 3 can sink or source three LS TTL inputs. It can drive

CMOS inputs without external pullups.

RST

A high level on this for two machine cycles while the

oscillator is running resets the device. An internal

pull-down resistor permits Power-On reset using only a

capacitor connected to VCC. As soon as the result is

applied (Vin), PORT 1, 2 and 3 are tied to 1. This

operation is achieved asynchronously even if the

oscillator is not start up.

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