CY8C5468LTI-037 Cypress Semiconductor Corp, CY8C5468LTI-037 Datasheet - Page 28

• Manufacturer Part Number: CY8C5468LTI-037
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY8C5468LTI-037

• Lead Free Status / Rohs Status: Compliant

6.4.1 Drive Modes
Each GPIO and SIO pin is individually configurable into one of
the eight drive modes listed in
are used for each pin (DM[2:0]) and set in the PRTxDM[2:0]
registers.
each of the eight drive modes.
state based on the port data register value or digital array signal
Table 6-6. Drive Modes
Document Number: 001-66238 Rev. *A
Note
9. Resistive pull up and pull down are not available with SIO in regulated output mode.
High Impedance Analog
The default reset state with both the output driver and digital
input buffer turned off. This prevents any current from flowing
in the I/O’s digital input buffer due to a floating voltage. This
state is recommended for pins that are floating or that support
an analog voltage. High impedance analog pins do not provide
digital input functionality.
Diagram
0
1
2
3
4
5
6
7
Figure 6-11
High impedence analog
High Impedance digital
Resistive pull up
Resistive pull down
Open drain, drives low
Open drain, drive high
Strong drive
Resistive pull up and pull down
depicts a simplified pin view based on
Drive Mode
Table
Table 6-6
[9]
0.
4.
DR
PS
DR
PS
[9]
Open Drain ,
Drives Low
High Impedance
Analog
6-6. Three configuration bits
shows the I/O pin’s drive
Pin
Pin
PRELIMINARY
[9]
1.
DR
PS
5.
DR
PS
Open Drain ,
High Impedance
Drives High
Digital
Figure 6-11. Drive Mode
PRTxDM2
Vddio
0
0
0
0
1
1
1
1
Pin
Pin
PS
2.
DR
PS
6.
PRTxDM1
DR
if bypass mode is selected. Note that the actual I/O pin voltage
is determined by a combination of the selected drive mode and
the load at the pin. For example, if a GPIO pin is configured for
resistive pull up mode and driven high while the pin is floating,
the voltage measured at the pin is a high logic state. If the same
GPIO pin is externally tied to ground then the voltage
unmeasured at the pin is a low logic state.
To achieve the lowest chip current in sleep modes, all I/Os
must either be configured to the high impedance analog mode,
or have their pins driven to a power supply rail by the PSoC
device or by external circuitry.
High Impedance Digital
The input buffer is enabled for digital signal input. This is the
standard high impedance (HiZ) state recommended for digital
inputs.
Strong Drive
Resistive
Pull-Up
PSoC
0
0
1
1
0
0
1
1
Vddio
Vddio
Pin
Pin
®
PRTxDM0
5: CY8C54 Family Datasheet
PS
3.
7.
DR
DR
PS
0
1
0
1
0
1
0
1
Resistive
Pull-Up and Pull-Down
Resistive
Pull-Down
Vddio
Vddio
Res High (5K)
Res High (5K)
PRTxDR = 1
Pin
Pin
Strong High
Strong High
Strong High
High Z
High Z
High Z
Page 28 of 105
Res Low (5K)
Res Low (5K)
PRTxDR = 0
Strong Low
Strong Low
Strong Low
High Z
High Z
High Z
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