COP884CG Datasheet, PDF (6/42 Pages) National Semiconductor (TI) – 8-Bit Microcontroller with UART and Three Multi-Function Timers

Comparators AC and DC Characteristics V_CC e 5V T_A e 25 C
Parameter
Conditions
Min
Typ
Input Offset Voltage
0 4V ^s V_IN ^s V_CC b 1 5V
g10
Input Common Mode Voltage Range
04
Low Level Output Current
V_OL e 0 4V
16
High Level Output Current
V_OH e 4 6V
16
DC Supply Current Per Comparator
(When Enabled)
Response Time
TBD mV Step TBD mV
1
Overdrive 100 pF Load
Max
g25
V_CC b 1 5
250
Units
mV
V
mA
mA
mA
ms
TL DD 9765–7
FIGURE 2 MICROWIRE PLUS Timing
Pin Descriptions
V_CC and GND are the power supply pins
CKI is the clock input This can come from an R C generat-
ed oscillator or a crystal oscillator (in conjunction with
CKO) See Oscillator Description section
RESET is the master reset input See Reset Description
section
The device contains three bidirectional 8-bit I O ports (C G
and L) where each individual bit may be independently con-
figured as an input (Schmitt trigger inputs on ports L and G)
output or TRI-STATE under program control Three data
memory address locations are allocated for each of these
I O ports Each I O port has two associated 8-bit memory
mapped registers the CONFIGURATION register and the
output DATA register A memory mapped address is also
reserved for the input pins of each I O port (See the memo-
ry map for the various addresses associated with the I O
ports ) Figure 3 shows the I O port configurations The
DATA and CONFIGURATION registers allow for each port
bit to be individually configured under software control as
shown below
CONFIGURATION DATA
Register
Register
Port Set-Up
0
0
Hi-Z Input
(TRI-STATE Output)
0
1
Input with Weak Pull-Up
1
0
Push-Pull Zero Output
1
1
Push-Pull One Output
TL DD 9765 – 8
FIGURE 3 I O Port Configurations
PORT L is an 8-bit I O port All L-pins have Schmitt triggers
on the inputs
The Port L supports Multi-Input Wake Up on all eight pins
L1 is used for the UART external clock L2 and L3 are used
for the UART transmit and receive L4 and L5 are used for
the timer input functions T2A and T2B L6 and L7 are used
for the timer input functions T3A and T3B
The Port L has the following alternate features
L0 MIWU
L1 MIWU or CKX
L2 MIWU or TDX
L3 MIWU or RDX
L4 MIWU or T2A
L5 MIWU or T2B
L6 MIWU or T3A
L7 MIWU or T3B
Port G is an 8-bit port with 5 I O pins (G0 G2 – G5) an input
pin (G6) and two dedicated output pins (G1 and G7) Pins
G0 and G2 – G6 all have Schmitt Triggers on their inputs Pin
G1 serves as the dedicated WDOUT WATCHDOG output
while pin G7 is either input or output depending on the oscil-
lator mask option selected With the crystal oscillator option
selected G7 serves as the dedicated output pin for the CKO
clock output With the single-pin R C oscillator mask option
selected G7 serves as a general purpose input pin but is
also used to bring the device out of HALT mode with a low
to high transition on G7 There are two registers associated
with the G Port a data register and a configuration register
Therefore each of the 5 I O bits (G0 G2 – G5) can be indi-
vidually configured under software control
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