SAB80C515A datasheet(11/57 Pages) SIEMENS

Part #	SAB80C515A

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

10

EA

51

49

I

External Access Enable

When held high, the SAB 80C515A executes

instructions from the internal ROM as long as

the PC is less than 32768. When held low, the

SAB 80C515A fetches all instructions from

external program memory. For the SAB

80C515A this pin must be tied low.

P0.0-P0.7 52-59

52-59

I/O

Port 0

is an 8-bit open-drain bidirectional 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 pullup

resistors when issuing 1's.

Port 0 also outputs the code bytes during

program verification in the SAB 80C515A.

External pullup resistors are required during

program verification.

P5.7-P5.0 60-67

60-67

I/O

Port 5 is an 8-bit bidirectional I/O port with

internal pullup resistors. Port 5 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 5 pins being

externally pulled low will source current

(IIL in the DC characteristics) because of the

internal pullup resistors.

HWPD

68

69

I

Hardware Power Down

A low level on this pin for the duration of one

machine cycle while the oscillator is running

resets the SAB 80C515A.

A low level for a longer period will force the

part to Power Down Mode with the pins float-

ing. (see table 5)

VCC

37

32, 33

–

Supply voltage

during normal, idle, and power-down operation.

VSS

38

34, 35

–

Ground (0 V)

N.C.

–

2, 13, 14, 23,

46, 50, 51,

68, 70, 71

–

Not connected

These pins of the P-MQFP-80 package must

not be connected.

Pin Definitions and Functions (cont’d)

Symbol

P-LCC-68

P-MQFP-80

Input (I)

Output (O)

Function

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SAB80C515A Datasheet(PDF) 11 Page - Siemens Semiconductor Group

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