IDT 89HPES24N3A, User Manual

Page: 148 / 168

IDT Configuration Registers
PES24N3A User Manual 9 - 54 April 10, 2008
Notes
GPIOFUNC - General Purpose I/O Control Function (0x418)
GPIOCFG - General Purpose I/O Configuration (0x41C)
GPIOD - General Purpose I/O Data (0x420)
SMBUSSTS - SMBus Status (0x424)
Bit
Field
Field
Name
Type
Default
Value
Description
15:0 GPIOFUNC RW 0x0
Sticky
GPIO Function. Each bit in this field controls the corre-
sponding GPIO pin. When set to a one, the corresponding
GPIO pin operates as the alternate function as defined in
Table 5.1 of Chapter 5. When a bit is cleared to a zero, the
corresponding GPIO pin operates as a general purpose I/O
pin.
31:16 Reserved RO 0x0 Reserved field.
Bit
Field
Field
Name
Type
Default
Value
Description
15:0 GPIOCFG RW 0x0
Sticky
GPIO Configuration. Each bit in this field controls the cor-
responding GPIO pin. When a bit is configured as a general
purpose I/O pin and the corresponding bit in this field is set,
then the pin is configured as a GPIO output. When a bit is
configured as a general purpose I/O pin and the corre-
sponding bit in this field is zero, then the pin is configured as
an input. When the pin is configured as an alternate func-
tion, the behavior of the pin is defined by the alternate func-
tion.
31:16 Reserved RO 0x0 Reserved field.
Bit
Field
Field
Name
Type
Default
Value
Description
15:0 GPIOD RW HWINIT
Sticky
GPIO Data. Each bit in this field controls the corresponding
GPIO pin. Reading this field returns the current value of
each GPIO pin regardless of GPIO pin mode (i.e., alternate
function or GPIO pin). Writing a value to this field causes the
corresponding pins which are configured as GPIO outputs to
change state to the value written.
31:16 Reserved RO 0x0 Reserved field.
Bit
Field
Field
Name
Type
Default
Value
Description
0 Reserved RO 0x0 Reserved field.
7:1 SSMBADDR RO HWINIT Slave SMBus Address. This field contains the SMBus
address assigned to the slave SMBus interface.
8 Reserved RO 0x0 Reserved field.
15:9 MSMBADDR RO HWINIT Master SMBus Address. This field contains the SMBus
address assigned to the master SMBus interface.
23:16 Reserved RO 0x0 Reserved field.