COP413C Datasheet, PDF (10/16 Pages) National Semiconductor (TI) – Single-Chip CMOS Microcontrollers

Functional Description (Continued)
I O CONFIGURATIONS
COP413C outputs have the following configurations illus-
trated in Figure 7
a Standard SO SK Output A CMOS push-pull buffer with
an N-channel device to ground in conjunction with a
P-channel device to V_CC compatible with CMOS and
LSTTL
b Low Current G Output This is the same configuration as
(a) above except that the sourcing current is much less
c Standard TRI-STATE L Output L output is a CMOS out-
put buffer similar to (a) which may be disabled by pro-
gram control
The SI and RESET inputs are Hi-Z inputs (Figure 7d )
When using the G I O port as an input set the output regis-
ter to a logic ‘‘1’’ level The P-channel device will act as a
pull-up load When using the L I O port as an input disable
the L drivers with the LEI instruction The drivers are then in
TRI-STATE mode and can be driven externally
All output drivers use one or more of three common devices
numbered 1 to 3 Minimum and maximum current (I_OUT and
V_OUT) curves are given in Figure 8 for each of these devices
to allow the designer to effectively use these I O configura-
tions
a Standard Push-Pull Output
b Low Current Push-Pull Output
c Standard TRI-STATE
‘‘L’’ Output
FIGURE 7 I O Configurations
d Hi-Z Input
TL DD 8537 – 7
SO SK L Port G Port
Minimum Sink Current
SO SK L Port Standard
Minimum Source Current
G Port Low Current
Minimum Source Current
COP413C COP413CH
Low Current G Port
Maximum Source Current
COP313C COP313CH
Low Current G Port
Maximum Source Current
Maximum Quiescent Current
FIGURE 8
10
TL DD 8537 – 8