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AN87C196 Datasheet(PDF) 12 Page - Intel Corporation

Part No. AN87C196
Description  CHMOS 16-BIT MICROCONTROLLER
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Maker  INTEL [Intel Corporation]
Homepage  http://www.intel.com
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PRODUCT PREVIEW
12
AUTOMOTIVE
®
T2CLK
I
Timer 2 External Clock
External clock for timer 2. Timer 2 increments (or decrements) on both rising
and falling edges of T2CLK. It is also used in conjunction with T2DIR for
quadrature counting mode.
T2CLK shares a package pin with P1.0 and EPA0.
T2DIR
I
Timer 2 External Direction
External direction (up/down) for timer 2. Timer 2 increments when T2DIR is
high and decrements when it is low. It is also used in conjunction with T2CLK
for quadrature counting mode.
T2DIR shares a package pin with P1.2 and EPA2.
TXJ1850
O
Transmit
This signal carries messages from the integrated J1850 module to an off-chip
J1850 transceiver. TXJ1850 must not be driven high during reset and should
only be used as an output.
TXJ1850 shares a package pin with P2.6, ONCE#, and CPVER.
TXD
O
Transmit Serial Data
In serial I/O modes 1, 2, and 3, TXD transmits serial port output data. In mode
0, it is the serial clock output.
TXD shares a package pin with P2.0 and PVER.
V
CC
PWR
Digital Supply Voltage
Connect each V
CC pin to the digital supply voltage.
V
PP
PWR
Programming Voltage
V
PP causes the device to exit powerdown mode when it is driven low for at least
50 ns. Use this method to exit powerdown only when using an external clock
source because it enables the internal phase clocks, but not the internal
oscillator.
If you do not plan to use the powerdown feature, connect V
PP to VCC.
V
REF
PWR
Reference Voltage for the A/D Converter
This pin supplies operating voltage to the A/D converter.
V
SS, VSS
1
GND
Digital Circuit Ground (Core Ground, Port Ground)
These pins supply ground for the digital circuitry. Connect each V
SS and VSS1
pin to ground through the lowest possible impedance path. V
SS pins are con-
nected to the core ground region of the microcontroller, while V
SS1 pins are con-
nected to the port ground region. (ANGND is connected to the analog ground
region.) Separating the ground regions provides noise isolation.
Table 4. Signal Descriptions (Continued)
Name
Type
Description




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