LPC47M112_07 SMSC [SMSC Corporation], LPC47M112_07 Datasheet - Page 153

• Manufacturer Part Number: LPC47M112_07
• Description: Enhanced Super I/O Controller with LPC Interface
• Manufacturer: SMSC [SMSC Corporation]

Enhanced Super I/O Controller with LPC Interface
Datasheet
User Note:
User Note 1:
User Note 2:
Note 1: If the EETI function is selected for this GPIO then both a high-to-low and a low-to-high edge will set the
SMSC DS – LPC47M112
Fan2 Tachometer
Register
Default = 0x00
on VTR POR
Fan1 Preload
Register
Default = 0x00
on VTR POR
Fan2 Preload
Register
Default = 0x00
on VTR POR
LED1
Default = 0x00
on VTR POR
LED2
Default = 0x00
on VTR POR
Keyboard Scan
Code
Default = 0x00
on VTR POR
N/A
PME, SMI and MSC status bits
NAME
When selecting an alternate function for a GPIO pin, all bits in the GPIO register must be properly
programmed, including in/out, polarity and output type. The polarity bit does not affect the DDRC
function or the either edge triggered interrupt functions.
If this pin is used for Ring Indicator wakeup, either the nRI2 event can be enabled via bit 1 in the
PME_EN1 register or the GP50 PME event can be enabled via bit 0 in the PME_EN5 register.
In order to use the P12, P16 and P17 functions, the corresponding GPIO must be programmed for
output, non-invert, and push-pull output type. The P17 function should not be selected on GP20
and GP 62 simultaneously. If P17 is selected on GP20 and GP62, simultaneously, then P17 on
GP62 will function and P17 on GP20 will not.
REG OFFSET
60-7F
(R/W)
(R/W)
(R/W)
(R/W)
(R/W)
(hex)
(R)
(R)
5A
5B
5C
5D
5E
5F
DATASHEET
Fan Tachometer Register 2
Bit[7:0] The 8-bit FAN2 tachometer count. The number of
counts of the internal clock per pulse of the fan. The count
value is computed from Equation 1. This value is the final
(maximum) count of the previous pulse (latched). The
value in this register may not be valid for up to 2 pulses
following a write to the preload register.
Fan Preload Register 1
Bit[7:0] The FAN1 tachometer preload. This is the initial
value used in the computation of the FAN1 count. Writing
this register resets the tachometer count.
Fan Preload Register 2
Bit[7:0] The FAN2 tachometer preload. This is the initial
value used in the computation of the FAN2 count. Writing
this register resets the tachometer count.
LED1
Bit[1:0] LED1 Control
00=off
01=blink at 1Hz rate with a 50% duty cycle (0.5 sec on, 0.5
sec off)
10=Blink at ½ HZ rate with a 25% duty cycle (0.5 sec on, 1.5
sec off)
11=on
Bits[7:2] Reserved
LED2
Bit[1:0] LED2 Control
00=off
01=blink at 1Hz rate with a 50% duty cycle (0.5 sec on, 0.5
sec off)
10=Blink at ½ HZ rate with a 25% duty cycle (0.5 sec on, 1.5
sec off)
11=on
Bits[7:2] Reserved
Keyboard Scan Code
Bit[0] LSB of Scan Code
Bit[7] MSB of Scan Code
Reserved – reads return 0
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Page 153
DESCRIPTION
Rev. 02-16-07