Acer Extensa 61X Service Manual page 86

Table 2-4 M7101 Pin Descriptions (Continued)
Name No.
PMU output interface (9)
CCFT 57
DISPLAY 58
SMIJ 18
SUSTATE 45
General purpose I/O interface(24)
General purpose I/O group A
GPIOA[7:0] 71-64
GPIOA7 (71)
/POSSTA
Major Chips Description
Type
O Backlight control. This signal is used to turn on/off LCD backlight.
FPVEE will AND with offset 0D2h D0 to generate CCFT. That is, if
both FPVEE and offset 0D2h D0 are high then CCFT will be high or
1Khz signal with programmed duty cycle by offset 0Fbh D[4:0].
Otherwise CCFT will be low.
O LCD Display On/Off control. This signal is used to control the LCD
display ON/OFF. If FPVEE goes from low to high, DISPLAY will
also go high after a period of about 62.5ms to 125ms. If not active,
it will go low immediately.
O System Management Interrupt. System Management interrupt
output. It is the SMIJ output when internal SMIJ is generated or the
IN_SMIJ input of the APM function is asserted. The high/low active
level can be selected. There are three types of active method :
1. If offset 0D2h D7=1,D3=0, this signal will be asserted until
reading/writing all of SMIJ status register's bits. This can be treated
as a level SMIJ.
2. If offset 0D2h D7=0, D3=1, this signal will be asserted until
reading/writing all of SMIJ status register's bits or a programmed
interval time out.
3. If offset 0D2h D7=0, D3=0, this signal will be asserted for an
interval time. This can be treated as a pulse SMIJ.
O SUSPEND STATE. When writing to port 0FAh or POSSTA goes
high, the SUSTATE will go high. The system will enter SUSPEND
mode. Only VDDS will supply the power, other VDD5 or VDD3 will
have no power. Only RI, RTC, HOTKEYJ or COVSW can wake up
the system and let the SUSTATE be low again. The VDD5 and
VDD3 will supply power.
I/O General Purpose I/O group A. These signals can be programmed to
be inputs or outputs. Offset 0D9h D[7:0] control the I/O attributes.
When programmed to be outputs, offset 0D8h D[7:0] will be set to
corresponding signal. When programmed to be inputs, the signal
can be read from the Offset 0D8h D[7:0] corresponding bits.
Offset 0D9h
D[n] = 0 GPIOA[n]= Input
GPIOA[n] value can be read from Offset 0D8h D[n]
1 GPIOA[n]= Output
Offset 0D8h D[n] value will be sent to GPIOA[n] where "n" is
from 7 to 0
I Positive input. When offset 0F6h D13='1', this pin will sense a high
level to active SUSTATE pin and force M7101 input suspend mode.
Description
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