MEC1404 Datasheet, PDF (339/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
22.6.1.2 Pin Control Register 2
Offset ^{See Note 22-6}
Bits
Description
Type
Default
Reset
Event
31:6 RESERVED
5:4 Drive Strength
These bits are used to select the drive strength on the pin.
00 = 2mA
01 = 4mA
10 = 8mA
11 = 12mA
3:1 RESERVED
0 Slew Rate
This bit is used to select the slew rate on the pin.
0 = slow (half frequency)
1 = fast
RES
R/W
-
-
00
nSYSR
ST
RES
R/W
-
-
0
nSYSR
ST
22.6.2 GPIO OUTPUT REGISTERS
If enabled by the GPIO Output Control Select bit, the grouped GPIO Output bits determine the level on the GPIO pin
when the pin is configured for the GPIO output function.
On writes:
If enabled via the GPIO Output Control Select
0: GPIO[x] out = ‘0’
1: GPIO[x] out = ‘1’
If disabled via the GPIO Output Control Select then the GPIO[x] out pin is unaffected by writing the corresponding GPIO
bit in the grouped Output GPIO[xxx:yyy] register.
On reads:
The GPIO output bit in the grouped Output GPIO[xxx:yyy] register returns the last programmed value, not the value on
the pin.
Note: Bits associated with GPIOs not implemented are Reserved.
22.6.2.1 Output GPIO[000:036]
Offset ^{280h (Note 22-3)}
Bits
Description
31 RESERVED
30:24 GPIO[036:030] Output
23:16 GPIO[027:020] Output
Type
RES
R/W
R/W
Default
-
00h
00h
Reset
Event
-
nSYSR
ST
nSYSR
ST
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DS00001956D-page 339