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| 型號： | EP7312-IV-C |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH SDRAM AND ENHANCED DIGITAL AUDIO INTERFACE |
| 中文描述： | 高性能，低功率系統(tǒng)，片上內(nèi)存和增強的數(shù)字音頻接口 |
| 文件頁數(shù)： | 9/64頁 |
| 文件大小： | 1710K |
| 代理商： | EP7312-IV-C |
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DS508PP5
Copyright Cirrus Logic, Inc. 2003
(All Rights Reserved)
9
EP7312
High-Performance, Low-Power System on Chip
64-Key Keypad Interface
Matrix keyboards and keypads can be easily read by the
EP7312.
A
dedicated
8-bit
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. The Keypad Interface has these
features:
column
driver
output
Column outputs can beindividually set high with the
remaining bits left at high-impedance
Column outputs can be driven all-low, all-high, or all-
high-impedance
Keyboard interruptdriven by OR'ing together all Port
A bits
Keyboard interrupt can beused to wake up the
system
8
×
8 keyboard matrix usable with no external logic,
extra keys can beadded with minimal glue logic
Table 10
shows theKeypad InterfacePin Assignments.
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 EP7312 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. The Interrupt controller
has these features:
Supports 22 interrupts from a variety of sources (such
as UARTs, SSI1, and key matrix.)
Routes interrupt sources to theARM720T’s IRQ or
FIQ (Fast IRQ) inputs
Fivededicated off-chip interruptlinesoperateaslevel
sensitiveinterrupts
Table 11
shows theinterrupt controller pin assignments.
.
Note:
Pins are multiplexed. See
Table 19 on page 11
for
more information.
Real-Time Clock
The EP7312 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.
Table 12
shows theReal-Time Clock pin assignments.
Driven by an external 32.768 kHz crystal oscillator
PLL and Clocking
The EP7312 processor and peripheral clocks have these
features:
Processor and peripheral clocks operate from a single
3.6864 MHz crystal or external 13 MHz clock
Programmable clock speeds allow theperipheral bus
to run at 18 MHz when theprocessor is set to 18 MHz
and at 36 MHz when the processor is set to 36, 49 or
74 MHz, and at 45 MHz when theprocessor is set to
90 MHz.
Table 13
shows thePLL and clocking pin assignments.
Table 10. Keypad Interface Pin Assignments
Pin Mnemonic
I/O
Pin Description
COL[7:0]
O
Keyboard scanner column drive
Table 11. Interrupt Controller Pin Assignments
Pin Mnemonic
I/O
Pin Description
nEINT[2:1]
I
External interrupt
EINT[3]
I
External interrupt
nEXTFIQ
I
External Fast Interrupt input
nMEDCHG/nBROM
(Note)
I
Media change interrupt input
Table 12. Real-Time Clock Pin Assignments
Pin Mnemonic
Pin Description
RTCIN
Real-Time Clock Oscillator Input
RTCOUT
Real-Time Clock Oscillator Output
VDDRTC
Real-Time Clock Oscillator Power
VSSRTC
Real-Time Clock Oscillator Ground
Table 13. PLL and Clocking Pin Assignments
Pin Mnemonic
Pin Description
MOSCIN
Main Oscillator Input
MOSCOUT
Main Oscillator Output
VDDOSC
Main Oscillator Power
VSSOSC
Main Oscillator Ground
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