Table 11. Pin State Table—GPIOs
Signal Name
[Alternate
Function]
Max
Load Supply
(pF)
Power
Down Note 5 V
Group
Pin
#
Output
Drive
Reset
State Operation
Normal
Suspend
State
Type
1
GPIO_CS0
GPIO_CS1
V19
Y20
B
B
B
B
50
50
VCC
VCC
I-PU
I-PU
I-PPU[O]
I-PPU[O]
I-PPU[O]
I-PPU[O]
E
E
S
S
1
Notes:
1. The GPIO_CS signals become inputs in Suspend mode with either a pullup resistor for devices that are left powered, or a
pulldown resistor for devices that are to be powered off.
Summary: GPIO_CS1–GPIO_CS0: Built-in pullup and pulldown resistors that are invoked by:
Reset invokes pullup.
When enabled as the GPIO_CS1–GPIO_CS0 signals:
As an output, the pullup and pulldown are disabled in all modes, and these GPIO_CSxs can be active in Suspend.
As an input, the pullup can be programmed to be enabled or disabled; this will then be the state of the pin in all modes,
including Suspend.
Table 12. Pin State Table—Serial Port
Signal Name
[Alternate
Function]
Max
Load Supply
(pF)
Power
Down Note 5 V
Group
Pin
#
Output
Drive
Reset
State Operation
Normal
Suspend
State
Type
1
CTS
DCD
DSR
DTR
RIN
V10
V9
I
I
VCC
VCC
VCC
I-PU
I-PU
I-PU
H
I-PU [I-PD]
I-PU [I-PD]
I-PU [I-PD]
O [TS-PD]
I-PU [I-PD]
O [TS-PD]
I-PU [I-PD]
O [TS-PD]
I-PU[I-PD]
I-PU[I-PD]
I-PU[I-PD]
TS-PD
D
1
D
1
W10
Y8
I
D
1
O
I
A
A
A
30
30
30
VCC
VCC
VCC
VCC
VCC
1
V11
W8
I-PU
H
I-PU[I-PD]
TS-PD
D
1
RTS
SIN
O
I
1
W11
Y10
I-PU
H
I-PU[I-PD]
TS-PD
D
1
SOUT
O
Notes:
1. The serial port output signals are three-state with built-in pulldown resistors in Suspend mode. The serial port input signals
can be left as inputs with pullups for a Suspend when the serial device is left powered. Or, they can be configured as inputs
with pulldown resistors if the serial device is to be powered off (Power-Down Group D).
Summary: The serial port output pins have built-in pulldown resistors that are invoked by Suspend mode.
Summary: The serial port input pins have built-in pullup and pulldown resistors that are invoked by:
–Reset invokes the pullup resistors.
–Operating: the pullup resistors are enabled.
–Suspend mode invokes the pulldown resistors if the serial interface is programmed to be powered off in Suspend (Power-
Down Group C); otherwise there are pullup resistors in Suspend mode.
Table 13. Pin State Table—Infrared Interface
Signal Name
[Alternate
Function]
Max
Load Supply
(pF)
Power
Down Note 5 V
Group
Pin
#
Output
Drive
Reset
State Operation
Normal
Suspend
State
Type
1
SIRIN
Y9
V8
I
VCC
I-PD
L
I-PPD
O
I-PPD
1
SIROUT
O
A
30
VCC
TS-PD
Notes:
1. The serial infrared interface output and input settle to Suspend states that allow the device to be powered up or off. The output
is three-state with a built-in pulldown resistor, and the input has a built-in pulldown resistor. The pulldown resistor on the input
pin (SIRIN) can be programmed to be disabled during normal operation and Suspend mode.
Summary: The serial infrared input pin has a built-in pulldown resistor that is invoked by:
–Reset invokes the pulldown resistor.
–The pulldown resistor is then programmable to be there or not.
52
Élan™SC400 and ÉlanSC410 Microcontrollers Data Sheet
AMD [ AMD ]
