ST7LITE20F2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7LITE20F2

8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, Timers, SPI

STMicroelectronics 

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I/O ports

ST7LITE20F2 ST7LITE25F2 ST7LITE29F2

Figure 32. Interrupt I/O port state transitions

01

00

10

11

INPUT

floating/pull-up

interrupt

INPUT

floating

(reset state)

OUTPUT

open-drain

OUTPUT

push-pull

XX = DDR, OR

10.4

10.5

10.6

10.7

Unused I/O pins

Unused I/O pins must be connected to fixed voltage levels. Refer to Section 13.8: I/O port

pin characteristics.

Low power modes

Table 24. Effect of low power modes on I/O ports

Mode

Description

WAIT

HALT

No effect on I/O ports. External interrupts cause the device to exit from WAIT mode.

No effect on I/O ports. External interrupts cause the device to exit from HALT mode.

Interrupts

The external interrupt event generates an interrupt if the corresponding configuration is

selected with DDR and OR registers and if the I bit in the CC register is cleared (RIM

instruction).

Table 25. I/O port interrupt control/wake-up capability

Interrupt event

Event flag

Enable

control bit

Exit from

WAIT

Exit from

HALT

External interrupt on selected

external event

−

DDRx

ORx

Yes

Yes

Device-specific I/O port configuration

The I/O port register configurations are summarized as follows:

Standard ports

Table 26. Ports PA7:0, PB6:0

Mode

Floating input

Pull-up input

DDR

OR

0

0

0

1

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Doc ID 8349 Rev 5

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