參數(shù)資料
型號: 21890
英文描述: ?lanSC300 Evaluation Board User's Manual
中文描述: ?lanSC300評估板用戶手冊
文件頁數(shù): 76/162頁
文件大小: 1974K
代理商: 21890
élanSC300 Microcontroller Evaluation Board User’s Manual
4-4
1
Power Management Control (PMC) Pins
The élanSC300 microcontroller has five Power Management Control (PMC) pins
that can be programmed high or low based on the current power management mode.
The élanSC300 microcontroller evaluation board makes use of the PMC pins as
follows.
PMC0
This pin is logically ORed with the system Reset pin from the élanSC300
microcontroller (RSTDRV) and fed to the reset pin of the 8042 keyboard controller.
It is used to perform a software reset to the 8042. A value of 1 drives the reset pin
of the 8042 active. A value of 0 allows for normal operation. The élanSC300
microcontroller Index ACh bits 3:0 control PMC0 and are set to 0 on power-up.
If you are not using PMU states that turn off the Low Speed PLL (i.e., Doze, Sleep
or Suspend modes) then you do not need to change the settings for this pin. Refer
to “8042 Keyboard Controller” on page 4-16 for a further explanation of when you
need to do a software reset.
PMC1
This pin is ANDed together with the card detect from slot 1 of the unbuffered
PCMCIA slot. It is used to control V
CC
power to both the buffered and unbuffered
PCMCIA slot 1. A value of 0 will cause V
CC
power to be applied to PCMCIA slot
1 at all times. A value of 1 will disable V
CC
power to PCMCIA slot 1 except for
the case when a card is inserted into the unbuffered slot 1. In this case V
CC
is applied
to both buffered and unbuffered PCMCIA slot 1.
PMC1
Pin
PCMCIA
Unbuffered Slot 1,
Card Detect
V
CC
Power to
PCMCIA
Unbuffered Slot 1
V
CC
Power to
PCMCIA
Buffered Slot 1
0
Card present
5 V
5 V
1
Card present
5 V
5 V
0
Card not present
5 V
5 V
1
Card not present
Disabled
Disabled
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