at85c51snd3b ATMEL Corporation, at85c51snd3b Datasheet - Page 9

• Manufacturer Part Number: at85c51snd3b
• Description: Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

7632C–MP3–11/06
Table 3. Timer 0 and Timer 1 Signal Description
Signal
Signal
P4.6:0
P5.3:0
Name
Name
INT0
INT1
T0
Type Description
Type Description
I/O
I/O
I
I
I
Port 4
P4 is a 7-bit bidirectional I/O port with internal pull-ups.
Port 5
P5 is a 4-bit bidirectional I/O port with internal pull-ups.
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.
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.
Timer 0 External Clock Input
When timer 0 operates as a counter, a falling edge on the T0 pin
increments the count.
AT85C51SND3B
NFCE2/SMINS
NFCE1/SMLCK
NFCE3/SMCE
LWR/LRW
Alternate
Function
LRD/LDE
Alternate
Function
LA0/LRS
OCLK
DCLK
DDAT
DSEL
SWR
SDR
SCS
P3.2
RTS
SCK
P3.3
CTS
P3.4
LCS
SA0
SS
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