lpc47s457-ns Standard Microsystems Corp., lpc47s457-ns Datasheet - Page 178

• Manufacturer Part Number: lpc47s457-ns
• Description: Advanced I/o With X-bus Interface
• Manufacturer: Standard Microsystems Corp.

SMSC LPC47S45x
GP43
Default = 0x01
on VTR POR
Bits[3:2]
(cleared)
POR, VTR POR and
PCI Reset
GP50
Default = 0x01
on VTR POR
GP51
Default = 0x01
on VTR POR
GP52
Default = 0x01
on VTR POR
NAME
are
on
reset
VCC
REG OFFSET
(R/W)
(R/W)
(R/W)
(R/W)
(hex)
3E
3F
40
41
DATASHEET
General Purpose I/0 bit 4.3
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[3:2] Alternate Function Select
11=Either Edge Triggered Interrupt Input 3
10=Reserved
01=Device Disable Register Control. The GP43 pin is an input,
with non-inverted polarity. When bits[3:2]=01, they cannot be
changed by writing to these bits; they are cleared by VCC POR,
PCI Reset and VTR POR. That is, when the DDRC function is
selected for this pin, it cannot be changed, except by a VCC POR,
PCI Reset or VTR POR.
The Device Disable register is controlled by the value of the GP43
pin as follows:
If the GP43 pin is high, the Device Disable Register is Read-Only.
If the GP43 pin is low, the Device Disable Register is Read/Write.
00=Basic GPIO function
Bits[6:4] Reserved
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
General Purpose I/0 bit 5.0
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[2] Alternate Function Select
1= RI2# (User Note 1)
0=GPIO
Bits[6:3] Reserved
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
General Purpose I/0 bit 5.1
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[2] Alternate Function Select
1= nDCD2
0=GPIO
Bits[6:3] Reserved
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
General Purpose I/0 bit 5.2
Bit[0] In/Out : =1 Input, =0 Output
Bit[1] Polarity : =1 Invert, =0 No Invert
Bit[3:2] Alternate Function Select
11=Reserved
10=IRRX (Note 6)
01=RXD2 (Note 6)
00=GPIO
Bits[6:4] Reserved
Bit[7] Output Type Select
1=Open Drain
0=Push Pull
Page 178 of 259
DESCRIPTION
Rev. 08-10-09