EP7311-IB Cirrus Logic Inc, EP7311-IB Datasheet - Page 9

• Manufacturer Part Number: EP7311-IB
• Description: IC ARM720T MCU 74MHZ 256-PBGA
• Manufacturer: Cirrus Logic Inc
• Series: EP7r

Specifications of EP7311-IB

• Core Processor: ARM7
• Core Size: 32-Bit
• Speed: 74MHz
• Connectivity: Codec, EBI/EMI, IrDA, Keypad, Multimedia Codec, SPI/Microwire1, UART/USART
• Peripherals: LCD, LED, MaverickKey, PWM
• Number Of I /o: 27
• Program Memory Type: ROMless
• Ram Size: 56K x 8
• Voltage - Supply (vcc/vdd): 2.3 V ~ 2.7 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-BGA
• Processor Series: EP73xx
• Core: ARM720T
• 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: -
• Data Converters: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1226

64-Keypad Interface
Matrix keyboards and keypads can be easily read by the
EP7311. A dedicated 8-bit column driver output generates
strobes for each keyboard column signal. The pins of Port A,
when configured as inputs, can be selectively OR'ed together
to provide a keyboard interrupt that is capable of waking the
system from a STANDBY or IDLE state.
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Interrupt Controller
When unexpected events arise during the execution of a
program (i.e., interrupt or memory fault) an exception is
usually generated. When these exceptions occur at the same
time, a fixed priority system determines the order in which
they are handled. The EP7311 interrupt controller has two
interrupt types: interrupt request (IRQ) and fast interrupt
request (FIQ). The interrupt controller has the ability to control
interrupts from 22 different FIQ and IRQ sources.
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DS506F1
COL[7:0]
Column outputs can be individually set high with the
remaining bits left at high-impedance
Column outputs can be driven all-low, all-high, or all-high-
impedance
Keyboard interrupt driven by OR'ing together all Port A
bits
Keyboard interrupt can be used to wake up the system
8×8 keyboard matrix usable with no external logic, extra
keys can be added with minimal glue logic
Supports 22 interrupts from a variety of sources (such as
UARTs, SSI1, and key matrix.)
Routes interrupt sources to the ARM720T’s IRQ or FIQ
(Fast IRQ) inputs
Five dedicated off-chip interrupt lines operate as level
sensitive interrupts
Pin Mnemonic
Table J. Keypad Interface Pin Assignments
I/O
O
Keyboard scanner column drive
Pin Description
©
Copyright Cirrus Logic, Inc. 2005
(All Rights Reserved)
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Real-Time Clock
The EP7311 contains a 32-bit Real Time Clock (RTC) that can
be written to and read from in the same manner as the timer
counters. It also contains a 32-bit output match register which
can be programmed to generate an interrupt.
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PLL and Clocking
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nEINT[2:1]
EINT[3]
nEXTFIQ
nMEDCHG/nBROM
MOSCIN
MOSCOUT
VDDOSC
VSSOSC
Note:
Driven by an external 32.768 kHz crystal oscillator
Processor and Peripheral Clocks operate from a single
3.6864 MHz crystal or external 13 MHz clock
Programmable clock speeds allow the peripheral bus to run
at 18 MHz when the processor is set to 18 MHz and at
36 MHz when the processor is set to 36, 49 or 74 MHz
RTCIN
RTCOUT
VDDRTC
VSSRTC
Pin Mnemonic
Pin Mnemonic
Pin Mnemonic
Table K. Interrupt Controller Pin Assignments
Table M. PLL and Clocking Pin Assignments
Pins are multiplexed. See
information.
Table L. Real-Time Clock Pin Assignments
High-Performance, Low-Power System on Chip
(Note)
Main Oscillator Input
Main Oscillator Output
Main Oscillator Power
Main Oscillator Ground
Real-Time Clock Oscillator Input
Real-Time Clock Oscillator Output
Real-Time Clock Oscillator Power
Real-Time Clock Oscillator Ground
I/O
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Table S on page 11
Pin Description
Pin Description
External interrupt
External interrupt
External Fast Interrupt input
Media change interrupt input
Pin Description
for more
EP7311
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