SAB83C515A-5M18-T3 datasheet(10/57 Pages) SIEMENS

Part #	SAB83C515A-5M18-T3

Description	8-Bit CMOS Single-Chip Microcontroller

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Manufacturer	SIEMENS [Siemens Semiconductor Group]

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SAB 80C515A/83C515A-5

Semiconductor Group

9

XTAL1

40

37

-

XTAL1

Output of the inverting oscillator amplifier.

To drive the device from an external clock

source, XTAL2 should be driven, while XTAL1

is left unconnected. There are no require-

ments on the duty cycle of the external clock

signal, since the input to the internal clok-

king circuitry is divided down by a divide-by-

two flip-flop. Minimum and maximum high and

low times and rise/fall times specified in the

AC characteristics must be taken into account.

P2.0-P2.7 41-48

38-45

I/O

Port 2

is an 8-bit bidirectional I/O port with internal

pullup resistors. Port 2 pins that have 1's

written to them are pulled high by the internal

pullup resistors, and in that state can be used

as inputs. As inputs, port 2 pins being

externally pulled low will source current (I IL, in

the DC characteristics) because of the internal

pullup resistors.

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 pullup

resistors when issuing 1's. During accesses to

external data memory that use 8-bit

addresses (MOVX@Ri), port 2 issues the

contents of the P2 special function register.

PSEN

49

47

O

The Program Store Enable

output is a control signal that enables the

external program memory to the bus during

external fetch operations. It is activated every

six oscillator periods, except during external

data memory accesses. The signal remains

high during internal program execution.

ALE

50

48

O

The Address Latch enable

output is used for latching the address into

external memory during normal operation. It is

activated every six oscillator periods, except

during an external data memory access.

Pin Definitions and Functions (cont’d)

Symbol

P-LCC-68

P-MQFP-80

Input (I)

Output (O)

Function

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SAB83C515A-5M18-T3 Datasheet(PDF) 10 Page - Siemens Semiconductor Group

SAB83C515A-5M18-T3 Datasheet(HTML) 10 Page - Siemens Semiconductor Group

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