C511 datasheet(103/128 Pages) SIEMENS

103 / 128 page

Semiconductor Group

9-3

EEPROM Programming Interface

SAB-C513A-H

PWR

Programming Write Control

A low level at this pin (and PCS=low and PRD=high) causes the

data at AD0-7 to be written into the data or control registers of

the programming interface.

PCS

Programming Chip Select

A low level at this pin enables the access to the registers of the

programming interface. If PCS is active, either PRD or PWR

control whether data is read or written into the registers. PCS

should always be deactivated between subsequent accesses

to the programming interface.

XTAL2

–

XTAL2

Output of the inverting oscillator amplifier.

XTAL1

–

XTAL1

Input to the inverting oscillator amplifier and input to the internal

clock generator circuits.

To drive the device from an external clock source, XTAL1

should be driven, while XTAL2 is left unconnected. During the

device programming a clock must be always supplied.

PMS0

PMS1

PMS2

PMS3

Programming Mode Select

PMS0-3 are used to put the SAB-C513A-H into the program-

ming mode. In normal mode the programming mode select pins

have the meaning as shown in the table below. PMS0-3 must

be set to the logic level as described in the table below.

–

Circuit ground potential

–

Power supply terminal for all operating modes

N.C.

1-9, 11-14,

23-31, 24

–

No connection

These pins must not be connected.

*) I = Input

O = Output

Table 9-1

Pin Definitions and Functions in Programming Mode (cont’d)

Symbol

Pin Number

I/O*) Function

P-LCC-44

Normal Mode

Pin Names

Progr. Mode

Pin Names

Required

Logic Level

PMS0

ALE

PMS1

PSEN

PMS2

RESET

PMS3

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