Rainbow-electronics AT89C5132 Manual do Utilizador descarregar pdf (Página 7)

AT8xC5132

4173A–8051–08/02

Table 3. Timer 0 and Timer 1 Signal Description

Signal

Name Type Description

Alternate

Function

INT0# I

Timer 0 Gate Input

INT0

serves as external run control for timer 0, when selected by

GATE0 bit in TCON register.

External Interrupt 0

INT0# input sets IE0 in the TCON register. If bit IT0 in this register is

set, bit IE0 is set by a falling edge on INT0#. If bit IT0 is cleared, bit IE0

is set by a low level on INT0#.

P3.2

INT1# I

Timer 1 Gate Input

INT1

serves as external run control for Timer 1, when selected by

GATE1 bit in TCON register.

External Interrupt 1

INT1# input sets IE1 in the TCON register. If bit IT1 in this register is

set, bit IE1 is set by a falling edge on INT1#. If bit IT1 is cleared, bit IE1

is set by a low level on INT1#.

P3.3

T0 I

Timer 0 External Clock Input

When timer 0 operates as a counter, a falling edge on the T0 pin

increments the count.

P3.4

T1 I

Timer 1 External Clock Input

When Timer 1 operates as a counter, a falling edge on the T1 pin

increments the count.

P3.5

Table 4. Audio Interface Signal Description

Signal

Name Type Description

Alternate

Function

DCLK O DAC Data Bit Clock -

DOUT O DAC Audio Data -

DSEL O

DAC Channel Select Signal

DSEL is the sample rate clock output.

SCLK O

DAC System Clock

SCLK is the oversampling clock synchronized to the digital audio data

(DOUT) and the channel selection signal (DSEL).

Table 5. USB Controller Signal Description

Signal

Name Type Description

Alternate

Function

D+ I/O

USB Positive Data Upstream Port

This pin requires an external 1.5 kΩ pull-up to V

for full speed

operation.

D- I/O USB Negative Data Upstream Port -

1 2 3 4 5 6 7 8 9 10 11 12 ... 161 162

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