EP9312-CBZ Cirrus Logic Inc, EP9312-CBZ Datasheet - Page 746
![IC ARM9 SOC UNIVERSAL 352PBGA](/photos/12/23/122390/mfg_ep9312_series_sml.jpg)
EP9312-CBZ
Manufacturer Part Number
EP9312-CBZ
Description
IC ARM9 SOC UNIVERSAL 352PBGA
Manufacturer
Cirrus Logic Inc
Series
EP9r
Specifications of EP9312-CBZ
Core Size
16/32-Bit
Core Processor
ARM9
Speed
200MHz
Connectivity
EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, SPI, UART/USART, USB
Peripherals
AC'97, DMA, I²: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
Package / Case
352-BGA
Controller Family/series
(ARM9)
No. Of I/o's
16
Ram Memory Size
16MB
Cpu Speed
200MHz
No. Of Timers
4
No. Of Pwm Channels
2
Digital Ic Case Style
BGA
Embedded Interface Type
AC97, I2S, SPI, UART, USB
Rohs Compliant
Yes
Processor Series
EP93xx
Core
ARM920T
Data Bus Width
32 bit
3rd Party Development Tools
MDK-ARM, RL-ARM, ULINK2
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Lead Free Status / Rohs Status
Details
Other names
598-1258
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25
25-8
Analog Touch Screen Interface
EP93xx User’s Guide
The difference between this new X value and the last valid X value is then compared against
the XMIN value stored in the TSXYMaxMin register (unless the X interrupt pending flag is
set). If the difference is less than this value no action is taken, and the algorithm continues by
discharging and scanning the Y-axis. If the difference between the new X value and the last X
value is greater than the XMIN value, the algorithm continues by comparing the difference
between the new X value and the last X value to the XMAX value in the TSXYMaxMin
register. If the difference is greater than XMAX, it is assumed that this distance is too far for a
touch input to possibly move in the short scan time interval and that the key press is invalid.
However, it is stored as the last recorded X location in case a truly new location is being
determined. The X move interrupt pending flag is also set at this point to cause the algorithm
to skip over the comparison to XMIN on consecutive sample sets. This flag will also cause a
ARM Core interrupt after valid X and Y samples have been established.
The algorithm then starts again, discharging and detecting a valid press. If the difference
between the new X value and the last stored X value is less than the XMAX value, the
algorithm stores the new X value, sets the X move interrupt pending flag and continues by
discharging and scanning a Y-axis value.
scanning process.
The Y-axis scan proceeds in the same fashion as the X-axis scan, except that the switch
matrix is now controlled by the TSYSample register. When the new Y value has been
calculated, the difference between this new Y value and the last valid Y value is then
compared against the YMIN value stored in the TSXYMaxMin register (unless the Y interrupt
pending flag is set). If the difference is less than this value, no Y action is taken and the
algorithm continues by checking the X interrupt pending flag. If this flag is set the Y value is
stored in the Y last register and the interrupt to the ARM Core is generated.
Copyright 2007 Cirrus Logic
Figure 25-4
is the flow chart demonstrating the
DS785UM1
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