Datasheet

PSoC Designer IDE Guide, Document # 001-42655 Rev *B 23
Chip-Level Editor
32K_Select
The 32K_Select parameter allows selection of the internal 32 kHz oscillator or an external crystal
oscillator. A complete discussion of the implications of this selection is found in the PSoC Technical
Reference Manual.
A_Buf_Power
A_Buf_Power allows the user to select the power level for the analog output buffers of the PSoC.
These buffers are used to supply internal analog signals to external pins on the PSoC. Power levels
may affect the frequency response and current drive capability of the output buffers. Complete tables
for the AC Analog Output Buffer Specifications and DC Analog Output Buffer Specifications are con-
tained in the applicable device data sheet.
AGNDBypass
A provision is made in some versions of the PSoC device to provide an external AGND bypass
capacitor to reduce the small amounts of switching noise present on the internal AGND. This feature
is switched on and off using the AGNDBypass global parameter. Typical values for the external
bypass capacitor are 0.01 μF and should not generally exceed 10 μF. The recommended value is 1
μF.
Analog Power
This parameter controls the power to the analog section of the PSoC. Power is controlled in three
stages:
1. All Analog Blocks Off
2. Continuous Time Blocks ON/Switched Capacitor Blocks OFF
3. Continuous Time Blocks ON/Switched Capacitor Blocks ON
For each of the two 'ON' cases, select reference drive levels of high, medium, and low to choose the
current drive capability for the internal reference buffers. All selections of this parameter, whether
used as a User Module Parameter or this Global Resource, need to agree. This selection affects the
total power consumption of the PSoC. Each user module using the reference and the opamp block
associated with it adds slightly to the power consumed by the device. Since the internal reference is
used as an integral part of most switched capacitor circuits, the current drive capability has an impact
on the speed at which the switched capacitor block operates. In general, higher settings for this
parameter allow switched capacitor circuits to operate at higher clock rates, at the expense of higher
power consumption. To estimate the current (and power) consumption per opamp block, refer to the
applicable table in the data sheet for the part: DC Operation Amplifier Specifications (ISOA).
Capture Clock
Selects the clock source for the Timer Capture Clock (TCAPCLK).
Capture Clock/N
Selects the Capture Clock divider value. The TCAPCLK will be Capture Clock source divided by N.
Capture Edge
Selects whether the capture timer data register has the First Hold data or the Most Recent edge
data. This option applies to all four capture timers.