C504 查看數據表（PDF） - Infineon Technologies

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C504

8-Bit Single-Chip Microcontroller

Infineon Technologies 

C504

Table 1

Pin Definitions and Functions (cont’d)

Symbol

Pin Number I/O1) Function

(P-MQFP-44)

CTRAP 6

I CCU Trap Input

With CTRAP = low, the compare outputs of the

CAPCOM unit are switched to the logic level as

defined in the COINI register (if they are enabled by

the bits in SFR TRCON). CTRAP is an input pin with

an internal pullup resistor. For power saving

reasons, the signal source which drives the CTRAP

input should be at high or floating level during

power-down mode.

XTAL2

14

– XTAL2

Output of the inverting oscillator amplifier.

XTAL1

15

– 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. There are no requirements on the

duty cycle of the external clock signal, since the

input to the internal clocking circuitry is divided down

by a divide-by-two flip-flop. Minimum and maximum

high and low times as well as rise/fall times specified

in the AC characteristics must be observed.

P2.0 - P2.7 18-25

I/O Port 2

is a 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

(IIL, 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.

Data Sheet

7

2000-05

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