Q67126-C2001 datasheet(10/65 Pages) SIEMENS

Part #	Q67126-C2001

Description	8-Bit CMOS Microcontroller

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Manufacturer	SIEMENS [Siemens Semiconductor Group]

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Semiconductor Group

10

1997-10-01

C540U

C541U

P2.0 - P2.7

24 - 31

28 - 35

I/O

Port 2

is an 8-bit quasi-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

32

38

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

33

39

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.

EA

35

42

I

External Access Enable

When held high, the C540U/C541U executes

instructions from the internal ROM as long as the

PC is less than 1000H for the C540U or less than

2000H for the C541U. When held low, the C540U/

C541U fetches all instructions from external

program memory. For the C540U-L/C541U-L this

pin must be tied low.

*) I = Input

O = Output

Table 2

Pin Deﬁnitions and Functions

(cont’d)

Symbol

Pin Numbers

I/O*) Function

P-LCC-44

P-SDIP-52

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Q67126-C2001 Datasheet(PDF) 10 Page - Siemens Semiconductor Group

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