參數(shù)資料
型號(hào)： DOC4106
廠商： Atmel Corp.
英文描述： Single-Chip Microcontroller with MP3 Decoder and Man-Machine Interface
中文描述： 單片微控制器，帶有MP3解碼器和人機(jī)界面
文件頁(yè)數(shù)： 8/47頁(yè)
文件大?。?/td> 791K
代理商： DOC4106
8
AT8xC51SND1C
4106F–8051–10/02
Table 11.
Keypad Interface Signal Description
Signal
Name
Type
Description
Alternate
Function
KIN3:0
I
Keypad Input Lines
Holding one of these pins high or low for 24 oscillator periods triggers a
keypad interrupt.
P1.3:0
Table 12.
External Access Signal Description
Signal
Name
Type
Description
Alternate
Function
A15:8
I/O
Address Lines
Upper address lines for the external bus.
Multiplexed higher address and data lines for the IDE interface.
P2.7:0
AD7:0
I/O
Address/Data Lines
Multiplexed lower address and data lines for the external memory or the
IDE interface.
P0.7:0
ALE
O
Address Latch Enable Output
ALE signals the start of an external bus cycle and indicates that valid
address information is available on lines A7:0. An external latch is used
to demultiplex the address from address/data bus.
-
ISP
I/O
ISP Enable Input
This signal must be held to GND through a pull-down resistor at the
falling reset to force execution of the internal bootloader.
-
RD
O
Read Signal
Read signal asserted during external data memory read operation.
P3.7
WR
O
Write Signal
Write signal asserted during external data memory write operation.
P3.6
Table 13.
System Signal Description
Signal
Name
Type
Description
Alternate
Function
RST
I
Reset Input
Holding this pin high for 64 oscillator periods while the oscillator is
running resets the device. The Port pins are driven to their reset
conditions when a voltage lower than V
IL
is applied, whether or not the
oscillator is running.
This pin has an internal pull-down resistor which allows the device to be
reset by connecting a capacitor between this pin and
V
DD
.
Asserting RST when the chip is in Idle mode or Power-down mode
returns the chip to normal operation.
-
TST
I
Test Input
Test mode entry signal. This pin must be set to
V
DD
.
-
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