Z8F082ASJ020EG Datasheet, PDF (70/282 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F082A Series
Product Specification
53
LED Drive Enable Register
The LED Drive Enable Register, shown in Table 31, activates the controlled current drive.
The Alternate Function Register has no control over the LED function; therefore, setting
the Alternate Function Register to select the LED function is not required. LEDEN bits
[7:0] correspond to Port C bits [7:0], respectively.
Table 31. LED Drive Enable (LEDEN)
Bit
7
6
5
4
3
2
1
0
Field
LEDEN[7:0]
RESET
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Address
F82H
Bit
Description
[7:0]
LEDENx
LED Drive Enable
These bits determine which Port C pins are connected to an internal current sink.
0 = Tristate the Port C pin.
1 = Enable controlled current sink on the Port C pin.
Note: x indicates the specific GPIO port pin number (7–0).
LED Drive Level High Register
The LED Drive Level registers contain two control bits for each Port C pin, as shown in
Table 32. These two bits select between four programmable drive levels. Each pin is indi-
vidually programmable.
Table 32. LED Drive Level High Register (LEDLVLH)
Bit
7
6
5
4
3
2
1
0
Field
LEDLVLH[7:0]
RESET
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Address
F83H
Bit
Description
[7:0]
LEDLVLHx
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
Note: x indicates the specific GPIO port pin number (7–0).
PS022827-1212
PRELIMINARY
GPIO Control Register Definitions