Z8 Encore! XP® 4K Series
Product Specification
48
0 = Tristate the Port C pin.
1= Enable controlled current sink on the Port C pin.
LED Drive Level High Register
The LED Drive Level registers contain two control bits for each Port C pin (Table 31).
These two bits select between four programmable drive levels. Each pin is individually
programmable.
Table 31. LED Drive Level High Register (LEDLVLH)
BITS
7
6
5
4
3
2
1
0
LEDLVLH[7:0]
FIELD
RESET
R/W
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
F83H
ADDR
LEDLVLH[7:0]—LED Level High Bit
{LEDLVLH, LEDLVLL} select one of four programmable current drive levels for each
Port C pin.
00 = 3 mA
01= 7 mA
10= 13 mA
11= 20 mA
LED Drive Level Low Register
The LED Drive Level registers contain two control bits for each Port C pin (Table 32).
These two bits select between four programmable drive levels. Each pin is individually
programmable.
Table 32. LED Drive Level Low Register (LEDLVLL)
BITS
7
6
5
4
3
2
1
0
LEDLVLL[7:0]
FIELD
RESET
R/W
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
F84H
ADDR
LEDLVLH[7:0]—LED Level High Bit
{LEDLVLH, LEDLVLL} select one of four programmable current drive levels for each
Port C pin.
PS022815-0206
General-Purpose I/O
ZILOG [ ZILOG, INC. ]
