C511 datasheet(15/128 Pages) SIEMENS

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Semiconductor Group

1-10

Introduction

ALE

The Address Latch Enable

output is used for latching the low-byte of the address into

external memory during normal operation. It is activated

every six oscillator periodes except during an external

data memory access.

If no external memory is used, the ALE signal generation

can be inhibited, reducing system RFI, by clearing

External Access Enable

When held at high level, instructions are fetched from the

internal ROM when the PC is less than the size of the

internal ROM :

C511

0A00H

C511A

1000H

C513

2000H

C513A/A-H

3000H

C513A-2R

4000H

When held at low level, the microcontroller fetches all

instructions from external program memory.

P0.0-P0.7

43-36

37-30

I/O

Port 0

is an 8-bit open-drain bidirectional I/O port. Port 0 pins

that have 1s written to them float, and in that state can be

used as high-impendance inputs. Port 0 is also the

multiplexed low-order address and data bus during

accesses to external program or data memory. In this

application it uses strong internal pullup transistors when

issuing 1s. External pullup resistors are required during

program verification.

–

Circuit ground potential

–

Power Supply terminal for all operating modes

N.C.

1, 12,

23, 34

6, 17,

28, 39

–

No connection, do not connect externally

*) I = Input

O = Output

Table 1-2

Pin Definitions and Functions (cont’d)

Symbol

Pin Number

I/O*) Function

P-LCC-

P-MQFP-

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