83C748 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

83C748

80C51 8-bit microcontroller family 2K/64 OTP/ROM, low pin count

Philips Electronics 

Philips Semiconductors

80C51 8-bit microcontroller family

2K/64 OTP/ROM, low pin count

Preliminary specification

83C748/87C748

A0–A10

ADDRESS STROBE

87C748

P3.0–P3.7

VCC

+5V

P0.0/ASEL

VSS

PROGRAMMING

PULSES

VPP/VIH VOLTAGE

SOURCE

CLK SOURCE

P0.1

P0.2

XTAL1

P1.0–P1.7

DATA BUS

RESET

CONTROL

LOGIC

RESET

Figure 5. Programming Configuration

SU00301

XTAL1

RESET

MIN 2 MACHINE

CYCLES

BIT 0 BIT 1

BIT 2

TEN BIT SERIAL CODE

BIT 3 BIT 4

BIT 5

BIT 6 BIT 7 BIT 8

BIT 9

P0.2 UNDEFINED

P0.1 UNDEFINED

Figure 6. Entry into Program/Verify Modes

SU00302

P0.2 (VPP) 5V

12.75V

tSHGL

25 PULSES

P0.1 (PGM)

P0.0 (ASEL)

tMASEL

tGLGH

98µs MIN

tAVGL

tGHGL

10µs MIN

PORT 3

PORT 1

tHASET

HIGH ADDRESS

tHAHLD

LOW ADDRESS

INVALID DATA

VERIFY MODE

tADSTA

VALID DATA

tDVGL tGHDX

DATA TO BE PROGRAMMED

PROGRAM MODE

Figure 7. Program/Verify Cycle

5V

tGHSL

tAVQV

INVALID DATA

VALID DATA

VERIFY MODE

SU00303

1999 Apr 15

13

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