C517A 查看數據表（PDF） - Infineon Technologies

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C517A

8-Bit CMOS Microcontroller

Infineon Technologies 

C517A

Table 1

Pin Definitions and Functions (cont’d)

6\PERO

VSS

3LQ 1XPEHU

304)3 3/&&

10, 62

37, 83

VDD

XTAL2

11, 63

12

38, 84

39

XTAL1

13

40

P2.0 - P2.7 14 - 21

41 - 48

*) I = Input

O = Output

,2 )XQFWLRQ

– Ground (0V)

during normal, idle, and power down

operation.

– Supply voltage

during normal, idle, and power down mode.

– XTAL2

is the input to the inverting oscillator

amplifier and input to the internal clock

generator circuits.

To drive the device from an external clock

source, XTAL2 should be driven, while

XTAL1 is left unconnected. Minimum and

maximum high and low times as well as rise/

fall times specified in the AC characteristics

must be observed.

– XTAL1

is the output of the inverting oscillator

amplifier. This pin is used for the oscillator

operation with crystal or ceramic resonator.

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.

Semiconductor Group

7

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