Legacy-Free Keyboard/Embedded Controller with SPI and LPC Docking Interface
20.4.3.4 Programmable Buffer Type Registers
The buffer types for the LGPIO Group H pins are programmable as open-drain or push-pull depending
on the bits in Table 20.30, "LGPIO Group H Buffer Type Configuration Register".
When the buffer type configuration bit is “1”, the LGPIO pin output buffer type is open-drain. When the
buffer type configuration bit is “0”, the LGPIO pin output buffer type is push-pull.
The buffer types for the OUT0 and GPIO7 pins are programmable as open-drain or push–pull depending
on the bits in Table 20.31, "GPIO Buffer Type Configuration Register".
Table 20.30 LGPIO Group H Buffer Type Configuration Register
N/A
HOST ADDRESS
8051 ADDRESS
POWER
0x7FAA
VCC1
0x00
DEFAULT
BIT
D7
D6
D5
D4
D3
R/W
D2
R/W
D1
R/W
D0
R/W
R
R
R
R
HOST TYPE
BIT NAME
Reserved
Reserved Reserved Reserved LGPIO63 LGPIO62 LGPIO61 LGPIO60
“1” selected an open-drain buffer type; “0” selects a push-pull buffer type.
Table 20.31 GPIO Buffer Type Configuration Register
N/A
HOST ADDRESS
8051 ADDRESS
POWER
0x7FAC
VCC1
0x00
DEFAULT
BIT
D7
D6
D5
D4
D3
D2
D1
R/W
D0
R/W
R
R
R
R
R
R
HOST TYPE
BIT NAME
Reserved
Reserved Reserved Reserved Reserved Reserved GPIO7
OUT0
“1” selects an open-drain buffer type; “0” selects a push-pull buffer type.
20.5
Bit-Wise Addressable 8051 SFR GPIOs
The LPC47N350 includes a bit-wise addressable SFR register (0x80) for SGPIO30-SGPIO33.
SMSC LPC47N350
235
Revision 1.1 (01-14-03)
DATASHEET
SMSC [ SMSC CORPORATION ]
