EP7309-CR Cirrus Logic Inc, EP7309-CR Datasheet - Page 5

• Manufacturer Part Number: EP7309-CR
• Description: 32-Bit Microcontroller IC
• Manufacturer: Cirrus Logic Inc

Specifications of EP7309-CR

• Controller Family/series: (ARM7)
• Core Size: 32 Bit
• No. Of Timers 8/12/16/32 Bits: 0 / 0 / 2 / 0
• Interface: SSI, UART
• Embedded Interface Type: SSI, UART
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Synchronous Serial Interface
• ADC (SSI) Interface: Master mode only; SPI and
• Selectable serial clock polarity
LCD Controller
A DMA address generator is provided that fetches video
display data for the LCD controller from memory. The
display frame buffer start address is programmable,
allowing the LCD frame buffer to be in SDRAM, internal
SRAM or external SRAM.
• Interfaces directly to a single-scan panel monochrome
• Interfaces to a single-scan panel color STN LCD with
• Panel width size is programmable from 32 to 1024
• Video frame buffer size programmable up to
• Bits per pixel of 1, 2, or 4 bits
64-Keypad Interface
Matrix keyboards and keypads can be easily read by the
EP7309. 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.
DS507PP1
ADCLK
ADCIN
ADCOUT
nADCCS
SMPCLK
CL1
CL2
DD[3:0]
FRM
M
Pin Mnemonic
Microwire1-compatible (128 kbps operation)
STN LCD
minimal external glue logic
pixels in 16-pixel increments
128 KB
Pin Mnemonic
Table G. Serial Interface Pin Assignments
Table H. LCD Interface Pin Assignments
I/O
O
O
O
O
O
I/O
O
O
O
O
I
LCD line clock
LCD pixel clock out
LCD serial display data bus
LCD frame synchronization pulse
LCD AC bias drive
SSI1 ADC serial clock
SSI1 ADC serial input
SSI1 ADC serial output
SSI1 ADC chip select
SSI1 ADC sample clock

Pin Description
Pin Description
Copyright 2001 Cirrus Logic (All Rights Reserved)
• Column outputs can be individually set high with the
• Column outputs can be driven all-low, all-high, or all-
• Keyboard interrupt driven by OR'ing together all Port
• Keyboard interrupt can be used to wake up the
• 8 × 8 keyboard matrix usable with no external logic,
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 EP7309 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.
• Supports 22 interrupts from a variety of sources (such
• Routes interrupt sources to the ARM720T’s IRQ or
• Five dedicated off-chip interrupt lines operate as level
.
Real-Time Clock
The EP7309 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.
COL[7:0]
nEINT[2:1]
EINT[3]
nEXTFIQ
nMEDCHG/nBROM
remaining bits left at high-impedance
high-impedance
A bits
system
extra keys can be added with minimal glue logic
as UARTs, SSI1, and key matrix.)
FIQ (Fast IRQ) inputs
sensitive interrupts
Note:
Pin Mnemonic
Pin Mnemonic
Table J. Interrupt Controller Pin Assignments
Pins are multiplexed. See
information.
Table I. Keypad Interface Pin Assignments
High-Performance, Low-Power System on Chip
(Note)
I/O
O
I/O
I
I
I
I
Table R on page 7
Keyboard scanner column drive
External interrupt
External interrupt
External Fast Interrupt input
Media change interrupt input
Pin Description
Pin Description
for more
EP7309
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