LG -P970 Service Manual page 77

UART/IrDA/CIR Overview
19.1 UArt/irDA/Cir overview
The device contains three universal asynchronous receiver/transmitter (UART) devices controlled by the
microprocessor unit (MPU) (see
• Three UART-only modules, UART1, UART2 and UART4 are pinned out for use as UART devices only.
UART1 and UART2 must be programmed by setting the UARTi.MDR1_REG[2:0] MODE_SELECT field
to one of the three UART operating modes.
• UART3, which adds infrared communication support, is pinned out for use as a UART, infrared data
3.12.2.7 UART
association (IrDA), or consumer infrared (CIR) device, and can be programmed to any available
operating mode.
The device contains three universal asynchronous receiver/transmitter devices.
Device
MPU subsystem
MPU SS INTC
sDMA
IVA2.2 subsystem
IVA2.2SS INTC
19.1.1 UART Features
The UARTs (UART1, UART2, UART3, UART4 when in UART mode) include the following key features:
• 16C750 compatibility
• 64-byte FIFO for receiver and 64-byte FIFO for transmitter
• Programmable interrupt trigger levels for FIFOs
• Baud generation based on programmable divisors N (N = 1 ... 16,384) operating from a fixed functional
2938 UART/IrDA/CIR
LGE Internal Use Only
Figure 19-1):
Figure 19-1. UArt Module
eDMA
UART1
(UART)
UART1.IRQ
2
UART1.DMA_RX/TX
32
32
UART2
(UART)
2
UART .DMA_RX/TX 2
UART2.IRQ
UART3
(UART/IrDa)
UART3.IRQ
2
UART3.DMA_RX/TX
32
32
UART4
(UART)
UART4.IRQ
2
UART4.DMA_RX/TX
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3. TECHNICAL BRIEF
uart1_tx
uart1_rx
uart1_rts
uart1_cts
uart2_tx
uart2_rx
uart2_rts
uart2_cts
uart3_tx/uart3_tx_irtx
uart3_rx/uart3_rx_irrx
uart3_rts/uart3_rts_sd
uart3_cts/uart3_cts_rctx
uart4_tx
uart4_rx
uart-001
SWPU176A – October 2009
Only for training and service purposes