EP9315-IBZ Cirrus Logic Inc, EP9315-IBZ Datasheet - Page 765

• Manufacturer Part Number: EP9315-IBZ
• Description: 32-Bit Microcontroller IC
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9315-IBZ

• Controller Family/series: (ARM9)
• Core Size: 32 Bit
• A/d Converter: 12 Bits
• Supply Voltage: 3.3V
• No. Of I/o Pins: 65
• Package / Case: 352-PBGA
• Clock Frequency: 200MHz
• Core Processor: ARM9
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, PCMCIA, SPI, UART/USART, USB
• Peripherals: AC'97, DMA, I&sup2:S, LCD, LED, MaverickKey, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 3.6 V
• Data Converters: A/D 8x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: EDB9315A-Z
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1144 - KIT DEVELOPMENT EP9315 ARM9
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details
• Other names: 598-1263

DS785UM1
26.2.1 Apparent Key Detection
When more than two keys are pressed, the key array controller may detect “apparent” keys.
An apparent key detection is caused by misinterpreting the basic electrical signals. For
example, in
The controller’s instruction is to decode the two keys with the lowest addresses. Therefore
the system interprets the electrical signals as:
• (ROW0, COL3) with address 0x03
• (ROW3, COL0) with address 0x18
• (ROW3, COL3) with address 0x1B
• An apparent key address of 0x00 at (ROW0, COL0)]
• An actual key address of 0x03 at (ROW0, COL3)
• No press for address 0x18 at (ROW3, COL0)
ROW 1
ROW 5
ROW 0
ROW 2
ROW 3
ROW 4
ROW 6
ROW 7
Figure
KEY 00H
KEY 20H
KEY 08H
KEY 10H
KEY 28H
KEY 30H
KEY 18H
KEY 38H
COL 0
26-3, three keys are pressed:
KEY 01H
KEY 09H
KEY 11H
KEY 21H
KEY 29H
KEY 31H
KEY 19H
KEY 39H
COL 1
Figure 26-2. 8 x 8 Key Array Diagram
Copyright 2007 Cirrus Logic
KEY 02H
KEY 0AH
KEY 22H
KEY 2AH
KEY 12H
KEY 1AH
KEY 32H
KEY 3AH
COL 2
KEY 03H
KEY 0BH
KEY 13H
KEY 1BH
KEY 23H
KEY 2BH
KEY 33H
KEY 3BH
COL 3
KEY 04H
KEY 0CH
KEY 14H
KEY 1CH
KEY 24H
KEY 2CH
KEY 34H
KEY 3CH
COL 4
COL 5
KEY 05H
KEY 0DH
KEY 25H
KEY 2DH
KEY 15H
KEY 1DH
KEY 35H
KEY 3DH
KEY 06H
KEY 0EH
KEY 16H
KEY 26H
KEY 2EH
KEY 36H
KEY 1EH
KEY 3EH
COL 6
EP93xx User’s Guide
Keypad Interface
COL 7
KEY 07H
KEY 27H
KEY 1FH
KEY 17H
KEY 2FH
KEY 37H
KEY 1FH
KEY 3FH
26-3
26