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TSC87251G2D-24CB Arkusz danych(PDF) 9 Page - ATMEL Corporation

Numer części TSC87251G2D-24CB
Szczegółowy opis  B/16-BIT MICROCONTROLLER WITH SERIAL COMMUNICATION INTERFACES
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

TSC87251G2D-24CB Arkusz danych(HTML) 9 Page - ATMEL Corporation

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AT/TSC8x251G2D
4135D–8051–08/05
T1:0
I/O
Timer 1:0 External Clock Inputs
When timer 1:0 operates as a counter, a falling edge on the T1:0 pin
increments the count.
T2
I/O
Timer 2 Clock Input/Output
For the timer 2 capture mode, T2 is the external clock input. For the Timer 2
clock-out mode, T2 is the clock output.
P1.0
T2EX
I
Timer 2 External Input
In timer 2 capture mode, a falling edge initiates a capture of the timer 2
registers. In auto-reload mode, a falling edge causes the timer 2 register to
be reloaded. In the up-down counter mode, this signal determines the
count direction: 1 = up, 0 = down.
P1.1
TXD
O
Transmit Serial Data
TXD outputs the shift clock in serial I/O mode 0 and transmits data in serial
I/O modes 1, 2 and 3.
P3.1
VDD
PWR
Digital Supply Voltage
Connect this pin to +5V or +3V supply voltage.
VPP
I
Programming Supply Voltage
The programming supply voltage is applied to this input for programming
the on-chip EPROM/OTPROM.
VSS
GND
Circuit Ground
Connect this pin to ground.
VSS1
GND
Secondary Ground 1
This ground is provided to reduce ground bounce and improve power
supply bypassing. Connection of this pin to ground is recommended.
However, when using the TSC80251G2D as a pin-for-pin replacement for a
8xC51 product, VSS1 can be unconnected without loss of compatibility.
Not available on DIP package.
VSS2
GND
Secondary Ground 2
This ground is provided to reduce ground bounce and improve power
supply bypassing. Connection of this pin to ground is recommended.
However, when using the TSC80251G2D as a pin-for-pin replacement for a
8xC51 product, VSS2 can be unconnected without loss of compatibility.
Not available on DIP package.
WAIT#
I
Real-time Synchronous Wait States Input
The real-time WAIT# input is enabled by setting RTWE bit in WCON
(S:A7h). During bus cycles, the external memory system can signal
‘system ready’ to the microcontroller in real time by controlling the WAIT#
input signal.
P1.6
WCLK
O
Wait Clock Output
The real-time WCLK output is enabled by setting RTWCE bit in WCON
(S:A7h). When enabled, the WCLK output produces a square wave signal
with a period of one half the oscillator frequency.
P1.7
WR#
O
Write
Write signal output to external memory.
P3.6
XTAL1
I
Input to the on-chip inverting oscillator amplifier
To use the internal oscillator, a crystal/resonator circuit is connected to this
pin. If an external oscillator is used, its output is connected to this pin.
XTAL1 is the clock source for internal timing.
Table 2. Product Name Signal Description (Continued)
Signal
Name
Type
Description
Alternate
Function


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