C513A-2RN datasheet(9/43 Pages) SIEMENS

Part #	C513A-2RN

Description	8-Bit CMOS Microcontroller

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Manufacturer	SIEMENS [Siemens Semiconductor Group]

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9 / 43 page

C511 / C513

Semiconductor Group

9

P3.0-P3.7

11,

13-19

11

13

14

15

16

17

18

19

5, 7-13

5

7

8

9

10

11

12

13

I/O

Port 3

is a bidirectional I/O port with internal pull-up resistors.

Port 3 pins that have 1s written to them are pulled high by

the internal pullup resistors, and in that state can be used

as inputs. As inputs, port 3 pins being externally pulled

low will source current (

I

IL, in the DC characteristics)

because of the internal pullup resistors. Port 3 also

contains the interrupt, timer, serial port and external

memory strobe pins that are used by various options. The

output latch corresponding to a secondary function must

be programmed to a one (1) for that function to operate.

The secondary functions are assigned to the pins of port

3 as follows:

P3.0

RXD

Receiver data input (asynchronous)

or data input/output (synchronous)

of serial interface (USART) 1)

P3.1

TXD

Transmitter data output (USART) 1)

(asynchronous) or clock output

(synchronous) of serial interface

P3.2

INT0

Interrupt 0 input / timer 0 gate control

P3.3

INT1

Interrupt 1 input / timer 1 gate control

P3.4

T0

Counter 0 input

P3.5

T1

Counter 1 input

P3.6

WR

Write control signal : latches the data

byte from port 0 into the external

data memory

P3.7

RD

Read control signal : enables the

external data memory to port 0

1) not available in the C511/511A

XTAL2

20

14

–

XTAL2

Output of the inverting oscillator amplifier.

*) I = Input

O = Output

Table 3

Pin Definitions and Functions (cont’d)

Symbol

Pin Number

I/O*) Function

P-LCC-

44

P-MQFP-

44

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C513A-2RN Datasheet(PDF) 9 Page - Siemens Semiconductor Group

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