EP9312-CB Cirrus Logic Inc, EP9312-CB Datasheet - Page 770

• Manufacturer Part Number: EP9312-CB
• Description: System-on-Chip Processor
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9312-CB

• Peak Reflow Compatible (260 C): No
• A/d Converter: 12 Bits
• Leaded Process Compatible: No
• No. Of I/o Pins: 65
• Package / Case: 352-BGA
• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, 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: 0°C ~ 70°C
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1257

26
KeyDiagnostic
26-8
Keypad Interface
EP93xx User’s Guide
31
15
Address:
Default:
Definition:
Bit Descriptions:
30
14
29
13
28
12
PRSCL:
0x808F_0004
0x0000_0000
Diagnostic key value register.
RSVD:
DIAG:
27
11
RSVD
26
10
Copyright 2007 Cirrus Logic
25
9
Row/Column counter pre-scaler load value. This value is
used to pre-load the RC pre-scale counter. The pre-scale
down counter counts the number of 1 MHz clocks for
every step of the RC counter. When the pre-scale counter
reaches 0, the RC counter steps. A pre-load value of
0x002 will cause the RC counter to step every three
clocks. The PRSCL value should never be set to 0x000 or
0x001, except for high speed counter tests, as the key
state machine will not resolve keys properly for these
values.
Key array scan time = clock period * (PRSCL+1)[64keys]
Example scan time for PRSCL[9:0] = 0x0FA
Scan time = 1 μs * (249 +1) = 16 ms
if de-bounce = 0xFC, key detection interrupt is fired in
approximately 48 ms.
Array scan time can range from 64 μsec. to 65.536 ms.
Reserved. Unknown during read.
Diagnostic key value. When diagnostic mode is enabled
(KeyScanInit.DIAG high) and this register is written, the
Row Column scan value is used to directly control the chip
key matrix scan drivers and receivers. Results are read
back via the KeyRegister.K bit.
24
8
RSVD
23
7
22
6
21
5
20
4
19
3
DIAG
18
2
17
1
DS785UM1
16
0