Z32AN00NW200SG Zilog, Z32AN00NW200SG Datasheet - Page 74

• Manufacturer Part Number: Z32AN00NW200SG
• Description: IC ARM922T MCU 200MHZ 256-BGA
• Manufacturer: Zilog
• Series: Encore!® 32r

Specifications of Z32AN00NW200SG

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, IrDA, SmartCard, SPI, UART/USART, USB OTG
• Peripherals: DMA, LCD, Magnetic Card Reader, POR, PWM, WDT
• Number Of I /o: 76
• Program Memory Type: ROMless
• Ram Size: 64K x 8
• Voltage - Supply (vcc/vdd): 1.71 V ~ 3.6 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-LBGA
• For Use With: 269-4713 - KIT DEV ENCORE 32 SERIES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Other names: 269-4717

Z32AN Series Data Sheet
9.2
9.2.1
9.2.2
DS0200-003
Direct Mode Operation of MCR
The peak detection algorithm is rather simple and consists of this:
Figure 9-2 depicts the peak detection algorithm.
Peak information stored in the FIFO is a 32-bit value with the following information:
The format of this can be found in MCR_FIFO. To save memory, using only 16-bits, discard the amplitude
information held in the upper bits (for the case of manual read from the FIFO) or program the DMA to use
only 16-bits (for the case of DMA operation).
Peak Detection Algorithm
Stored Peak Information
1.
2.
3.
4.
5.
6.
7.
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The user programs the positive and negative minimum threshold registers.
Once the minimum positive threshold is crossed, the Peak Detector begins searching for a
positive peak. This first value over the minimum is registered.
Every incoming sample is compared to the registered value.
If the incoming sample is greater, it is registered and the old value is discarded. Otherwise, the
incoming sample is ignored.
If the incoming sample falls below the negative threshold, the Peak Detector stores the positive
peak information in the FIFO and begins the search for the negative peak.
The negative peak search is analogous to the positive peak search.
The Peak Detector alternates between the negative and positive peak searches until a time-
out occurs.
Delta-time from previous peak
Track number
Polarity of current peak
Whether a time-out caused this entry into the FIFO
Amplitude of current peak
Figure 9-2: Peak Detection Algorithm
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