LPC47M172_07 SMSC [SMSC Corporation], LPC47M172_07 Datasheet - Page 125

• Manufacturer Part Number: LPC47M172_07
• Description: Advanced I/O Controller with Motherboard GLUE Logic
• Manufacturer: SMSC [SMSC Corporation]

Note 1:
7.27.3 GPIO Control
SMSC LPC47M172
nCDC_DWN_ENAB
DDCSDA_5V
DDCSCL_5V
DDCSDA_3V
DDCSCL_3V
FUNCTION
The GPIO Data and Configuration Registers are located in GPIO/Runtime Register block at the offset
shown from the GPIO/Runtime Register Block logical device base address.
Each GPIO port has an 8-bit control register that controls the behavior of the pin. These registers are
defined in GPIO Runtime Registers section when LD_NUM=0 and Chapter 10 Runtime Register Block
Runtime Registers when LD_NUM=1.
Each GPIO port may be configured as either an input or an output. If the pin is configured as an output, it
can be programmed as open-drain or push-pull. Inputs and outputs can be configured as non-inverting or
inverting. Bit[0] of each GPIO Configuration Register determines the port direction, bit[1] determines the
signal polarity, and bit[7] determines the output driver type select.
The Polarity Bit (bit 1) of the GPIO control registers control the GPIO pin when the pin is configured for the
GPIO function and when the pin is configured for the alternate function for all pins, with the exception of
the either edge triggered interrupts and DDC functions.
The basic GPIO configuration options are summarized in Table 7.18.
DEFAULT
Reserved
GP10
GP11
GP12
GP13
GP14
GP15
GP16
GP17
SELECTED
FUNCTION
GPIO
ALT. FUNC. 1
Table 7.17 - General Purpose I/O Port Assignments
FAN_TACH1
FAN_TACH2
DIRECTION
GP24
GP20
GP21
GP22
GP23
Table 7.18 - GPIO Configuration Summary
-
-
-
-
-
-
-
BIT
B0
0
0
1
1
DATASHEET
POLARITY
ALT. FUNC. 2
BIT
Page 125
EETI0
EETI1
B1
0
1
0
1
-
-
-
-
-
-
-
-
-
-
-
-
Pin is a non-inverted output.
Pin is an inverted output.
Pin is a non-inverted input.
Pin is an inverted input.
REGISTER
DATA
GP1
GP2
Advanced I/O Controller with Motherboard GLUE Logic
DESCRIPTION
SMSC/Non-SMSC Register Sets (Rev. 01-11-07)
1
REGISTER
BIT NO.
DATA
7:5
1
2
3
4
5
6
0
1
2
3
4
0
7
REGISTER
RUNTIME
OFFSET
(HEX)
GPIO
15
16
Datasheet