83C196LC Intel Corporation, 83C196LC Datasheet - Page 9

• Manufacturer Part Number: 83C196LC
• Description: CHMOS 16-BIT MICROCONTROLLER
• Manufacturer: Intel Corporation

T2DIR
TXD
V
V
V
WR#
WRL#
ADVANCE INFORMATION
CC
PP
SS
Name
Type
PWR
PWR
GND
O
O
O
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.
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.
Digital Supply Voltage
Connect each V
Powerdown Exit
V
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
Digital Circuit Ground
These pins supply ground for the digital circuitry. Connect each V
ground through the lowest possible impedance path.
Write
This active-low output indicates that an external write is occurring. This signal is
asserted only during external memory writes.
WR# shares a package pin with P5.2 and WRL#.
†
Write Low
During 16-bit bus cycles, this active-low output signal is asserted for low-byte
writes and word writes to external memory. During 8-bit bus cycles, WRL# is
asserted for all write operations.
WRL# shares a package pin with P5.2 and WR#.
†
PP
When this pin is configured as a special-function signal (P5_MODE.2 = 1), the
chip configuration register 0 (CCR0) determines whether it functions as WR#
or WRL#. CCR0.2 = 1 selects WR#; CCR0.2 = 0 selects WRL#.
When this pin is configured as a special-function signal (P5_MODE.2 = 1), the
chip configuration register 0 (CCR0) determines whether it functions as WR#
or WRL#. CCR0.2 = 1 selects WR#; CCR0.2 = 0 selects WRL#.
causes the device to exit powerdown mode when it is driven low for at least
Table 4. Signal Descriptions (Continued)
†
†
CC
pin to the digital supply voltage.
Description
AUTOMOTIVE — 83C196LC, 83C196LD
PP
to V
SS
CC
.
pin to
9