LH7A404 Sharp Electronics, LH7A404 Datasheet - Page 27

• 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

32-Bit System-on-Chip
UART/IrDA
UART2, and UART3.
• Serial-to-Parallel conversion on data received from
• Parallel-to-Serial conversion on data transmitted to
through the DMA separately or simultaneously, and are
buffered with internal FIFO memories. This allows up to
16 bytes to be stored independently in both transmit and
receive modes. The UART can generate:
• Four individually maskable interrupts from the
• A single combined interrupt so that the output is
reception, the appropriate error bit is set and stored in
the FIFO. If an overrun condition occurs, the overrun
register bit is set immediately and the FIFO data is pre-
vented from being overwritten. UART1 also supports
IrDA 1.0 (15.2 kbit/s).
(CTS), Data Carrier Detect (DCD) and Data Set Ready
(DSR) are supported on UART2 and UART3.
Timers
Each of the timers can operate in two modes: free run-
ning and pre-scale. The timers are programmed using
four registers; Load, Value, Control, and Clear.
(TC2), use clock sources of either 508 kHz or 2 kHz. The
clock source and mode are selectable by writing to the
appropriate bits in the system control register. Each
timer has a 16-bit read/write data register and a control
register. The timer is immediately loaded with the value
written to the data register. This value is then decre-
mented on the next active clock edge to arrive after the
write. When the timer underflows, it immediately asserts
its appropriate interrupt.
clocked from a single 7.3728 MHz source. Once the
timer has been enabled and written to, it decrements
on the next rising edge of the 7.3728 MHz clock after
the data register has been updated.
Data Sheet
the peripheral device
the peripheral device.
receive, transmit, and modem status logic blocks
asserted if any of the individual interrupts are
asserted and unmasked.
The LH7A404 contains three UARTs; UART1,
The UART performs:
The transmit and receive paths can both be routed
If a framing, parity or break error occurs during
The modem status input signals Clear to Send
The LH7A404 includes three programmable timers.
Two identical timers, Timer 1 (TC1) and Timer 2
Timer 3 (TC3) has the same basic operation, but is
Version 1.5
FREE-RUNNING MODE
0xFFFF when it underflows and continues counting down.
PRE-SCALE MODE
each timer is automatically re-loaded when the timer
underflows. This mode can be used to produce a pro-
grammable frequency to drive the buzzer or generate a
periodic interrupt.
Real Time Clock (RTC)
time-base counter. This is achieved by generating an
interrupt signal after counting for a programmed num-
ber of cycles of a real-time clock input. Counting in one-
second intervals is achieved by use of a 1 Hz clock
input to the RTC.
Keyboard and Mouse Interface (KMI)
following features:
• IBM PS/2 or AT-compatible keyboard or mouse
• Half-duplex, bidirectional synchronous serial inter-
• Programmable 4-bit reference clock divider
• Polled or interrupt-driven mode
• Separately maskable transmit and receive interrupts
• Single combined interrupt output
• Odd parity generation and checking
• Register bits for override of keyboard clock and
for functional verification and manufacturing test.
A/D Converter with Brownout Detector and
Touch Screen Controller
integrated Touch Screen Controller (TSC) and brown-
out detector. The TSC is a complete interface to a
Touch Screen for portable personal devices. It com-
bines the front-end biasing and control circuitry with
A/D conversion, reference generation, and digital inter-
face functions to completely replace external ICs used
to implement this interface. The ADC features:
• A 10-bit A/D converter with integrated sample-and-
• Active matrix for bias and control circuits necessary
interface
face using open-drain outputs for clock and data.
data lines.
hold, fully differential, high impedance signal and ref-
erence inputs
for connection to external 4-, 5-, 7-, and 8-wire touch
panels, including pen pressure implementation
In free-running mode, the timer wraps around to
In pre-scale (periodic) mode, the value written to
The RTC provides a basic alarm function or long
The Keyboard and Mouse Interface has the
Additional test registers and modes are implemented
The LH7A404 includes an A/D Converter (ADC) with
LH7A404
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