參數(shù)資料
型號(hào)： XR19L220IL40-0B-EB
廠商： Exar Corporation
文件頁(yè)數(shù)： 41/43頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR19L202 40QFN
標(biāo)準(zhǔn)包裝： 1
系列： *
XR19L220
7
REV. 1.0.2
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
2.2
5-Volt Tolerant Inputs
The CMOS/TTL level inputs of the L220 can accept up to 5V inputs when operating at 3.3V. Note that the
XTAL1 pin is not 5V tolerant when an external clock supply is used.
2.3
Device Hardware Reset
The RESET or RESET# input resets the internal registers and the serial interface outputs in both channels to
their default state (see Table 11). An active pulse of longer than 40 ns duration will be required to activate the
reset function in the device.
2.4
Device Identification and Revision
The XR19L220 provides a Device Identification code and a Device Revision code to distinguish the part from
other devices and revisions. To read the identification code from the part, it is required to set the baud rate
generator registers DLL and DLM both to 0x00. Now reading the content of the DLM will provide 0x01 to
indicate functional compatibility with XR16L580 and reading the content of DLL will provide the revision of the
part; for example, a reading of 0x01 means revision A.
2.5
Internal Registers
The L220 has a set of enhanced registers for control, monitoring and data loading and unloading. The
configuration register set is compatible to those already available in the standard 16C550. These registers
function as data holding registers (THR/RHR), interrupt status and control registers (ISR/IER), a FIFO control
register (FCR), receive line status and control registers, (LSR/LCR), modem status and control registers (MSR/
MCR), programmable data rate (clock) divisor registers (DLL/DLM), and an user accessible Scratchpad
register (SPR).
Beyond the general 16C550 features and capabilities, the L220 offers enhanced feature registers just like the
XR16L580, namely, EFR, Xon1, Xoff 1, Xon1 and Xoff2 that provide automatic RTS and CTS hardware flow
control and Xon/Xoff software flow control. All the register functions are discussed in full detail later in “Section
2.6
DMA Mode
The DMA Mode (a legacy term) refers to data block transfer operation. The DMA mode affects the state of the
RXRDY# and TXRDY# output pins available in the original 16C550. These pins are not available in the
XR19L220. The DMA Enable bit (FCR bit-3) does not have any function in this device and can be a ’0’ or a ’1’.
2.7
INT (IRQ#) Output
The interrupt output changes according to the operating mode and enhanced features setup. Table 1 and
Table 2 below summarize the operating behavior for the transmitter and receiver in the Intel and Motorola
modes. Also see Figures 18 through 21.
TABLE 1: INT (IRQ#) PIN OPERATION FOR TRANSMITTER
FCR BIT-0 = 0 (FIFO DISABLED)
FCR BIT-0 = 1 (FIFO ENABLED)
INT Pin
(I/M# = 1)
0 = one byte in THR
1 = THR empty
0 = FIFO above trigger level
1 = FIFO below trigger level or FIFO empty
IRQ# Pin
(I/M# = 0)
1 = one byte in THR
0 = THR empty
1 = FIFO above trigger level
0 = FIFO below trigger level or FIFO empty
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