LH7A404 Sharp Electronics, LH7A404 Datasheet - Page 18

• Manufacturer Part Number: LH7A404
• Manufacturer: Sharp Electronics

Specifications of LH7A404

• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Processing Unit: Microcontroller
• Operating Supply Voltage (min): 1.71V
• Operating Supply Voltage (typ): 1.8V
• Operating Supply Voltage (max): 1.89V
• Package Type: CABGA
• Pin Count: 324
• Mounting: Surface Mount
• Rad Hardened: No
• Lead Free Status / RoHS Status: Not Compliant

LH7A404
SYSTEM DESCRIPTIONS
ARM922T Processor
cached core with an Advanced High-performance Bus
(AHB) interface. The processor is a member of the
ARM9T family of processors. For more information, see
the ARM document, ‘ARM922T Technical Reference
Manual’, available on ARM’s website at www.arm.com.
Clock and State Controller
around two primary oscillator inputs. These are the
14.7456 MHz input crystal and the 32.768 kHz real time
clock oscillator; see Figure 3. The 14.7456 MHz oscil-
lator supplies the main system clock domains for the
LH7A404. The 32.768 kHz oscillator controls the
power-down operations and real time clock peripheral.
The clock and state controller provides the clock gating
and frequency division necessary, and then supplies
the clocks to the processor and rest of the system. The
amount of clock gating that actually takes place
depends on the power saving mode selected.
18
The LH7A404 microcontroller features the ARM922T
The clocking scheme in the LH7A404 is based
COMPACT
FLASH
CARD
PC
FLASH
SDRAM
ROM
SRAM
PCMCIA
DEVICE
HOST
1
4
7
*
2
5
8
0
GPIO
3
6
9
#
Figure 2. Application Diagram
LH7A404
USB
HOST
Version 1.5
STN/TFT/
AD-TFT
Real Time Clock tree and power-down logic. This clock
is used for the power state control and is the only clock
in the LH7A404 that runs continuously. The 32.768 kHz
clock is divided down to 1 Hz for the Real Time Clock
counter using a ripple divider to save power.
main system clocks for the LH7A404. It is the source
for PLL1 and PLL2, the primary clock for the peripher-
als, and the source clock to the programmable clock
(PGM) divider.
erates the following clocks: FCLK, HCLK, and PCLK.
FCLK is the clock that drives the ARM922T core.
all memory interfaces, bus arbitrators and the AHB
peripherals. HCLK is generated by dividing FCLK by 1,
2, 3, or 4. HCLK can be gated by the system to enable
low power operation.
ated by dividing HCLK by either 2, 4, or 8.
USB peripheral.
IR
The 32.768 kHz clock provides the source for the
The 14.7456 MHz source is used to generate the
PLL1 provides the main clock tree for the chip. It gen-
HCLK is the main bus (AHB) clock, as such it clocks
PCLK is the peripheral bus (APB) clock. It is gener-
PLL2 generates a fixed 48 MHz clock signal for the
UART
SSP
SCREEN
CONTR.
BMI
TOUCH
BATTERY
SCI
SMART
CARD
MMC/SD
DMA
AC97
DC to DC
GENERATION
CODEC
CIRCUITRY
32-Bit System-on-Chip
VOLTAGE
MULTIMEDIA
CARD
Data Sheet
LH7A404-2