SAKC505A-4EM 查看數據表（PDF） - Siemens AG

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SAKC505A-4EM

8-Bit CMOS Microcontroller

Siemens AG 

C505 / C505C

C505A / C505CA

Table 3

Pin Definitions and Functions (cont’d)

Symbol

P4.0

P4.1

Pin Number I/O

*)

6

I/O

28

I/O

XTAL2

14

O

XTAL1

15

I

*) I = Input

O = Output

Function

Port 4

is a 2-bit quasi-bidirectional port with internal pull-up

arrangement. Port 4 pins that have 1’s written to them are

pulled high by the internal pull-up transistors and in that

state can be used as inputs. As inputs, port 4 pins being

externally pulled low will source current (IIL, in the DC

characteristics) because of the internal pullup transistors.

The output latch corresponding to the secondary function

RXDC must be programmed to a one (1) for that function to

operate. The secondary functions are assigned to the two

pins of port 4 as follows (C505C and C505CA only) :

P4.0 / TXDC

Transmitter output of CAN controller

P4.1 / RXDC

Receiver input of CAN controller

XTAL2

Output of the inverting oscillator amplifier.

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. To

operate above a frequency of 16 MHz, a duty cycle of the

etxernal clock signal of 50 % should be maintained.

Minimum and maximum high and low times as well as rise/

fall times specified in the AC characteristics must be

observed.

Semiconductor Group

10

1997-12-01

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