Q67120-C1045 データシートの表示（PDF） - Infineon Technologies

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Q67120-C1045

8-Bit CMOS Microcontroller

Infineon Technologies 

C509-L

Table 1

Pin Definitions and Functions (cont’d)

Symbol

P9.0 - P9.7

XTAL2

XTAL1

*) I = Input

O = Output

Pin Number

74-77,

5-2

12

13

I/O*) Function

I/O Port 9

is an 8-bit quasi-bidirectional I/O port with internal pullup

resistors. Port 9 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 9 pins being

externally pulled low will source current (I IL, in the DC

characteristics) because of the internal pullup resistors.

Port 9 can also be switched into a bidirectional mode, in

which CMOS levels are provided. In this bidirectional

mode, each port 1 pin can be programmed individually

as input or output.

Port 9 also serves alternate compare functions. The out-

put 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 9 as follows :

P9.0-P9.7 CC10-CC17 Compare/capture channel 0-7

output/input

– XTAL2

is the input to the inverting oscillator amplifier and input

to the internal clock generator circuits.

When supplying the C509-L with an external clock

source, XTAL2 should be driven, while XTAL1 is left

unconnected. A duty cycle of 0.4 to 0.6 of the clock

signal is required. Minimum and maximum high and low

times as well as rise/fall times specified in the AC

characteristics must be observed.

– XTAL1

Output of the inverting oscillator amplifier. This pin is

used for the oscillator operation with crystal or ceramic

resonartor

Semiconductor Group

6

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