參數(shù)資料
型號(hào)： XR16L651
廠商： Exar Corporation
英文描述： 2.5V, 3.3V and 5V Low Power UART with 32-Byte FIFO(2.5V, 3.3V和5V 低功耗通用異步接收器/發(fā)送器（帶32字節(jié)先進(jìn)先出）)
中文描述： 2.5V，3.3V與5V的低功耗的UART與32字節(jié)的FIFO（2.5伏，3.3伏和5V的低功耗通用異步接收器/發(fā)送器（帶32字節(jié)先進(jìn)先出））
文件頁數(shù)： 17/46頁
文件大?。?/td> 516K
代理商： XR16L651
á
XR16L651
2.5V, 3.3 AND 5V LOW POWER UART WITH 32-BYTE FIFO
PRELIMINARY
REV. P1.0.0
17
The 651 has a set of configuration registers selected
by address lines A0 to A2. The based page registers
are 16C550 compatible with EXAR enhanced feature
registers located on the second page (mirror) ad-
dresses. The second page registers are only accessi-
ble by setting LCR register to a value of 0xBF. The
register set is shown on Table 7 and Table 8.
T
ABLE
7: XR16L651 UART CONFIGURATION REGISTERS
A
DDRESS
R
EGISTER
R
EAD
/W
RITE
C
OMMENTS
A2 A1 A0
16550 C
OMPATIBLE
R
EGISTERS
0 0 0
RHR - Receive Holding Reg
THR - Transmit Holding Register
Read-only
Write-only
LCR[7] = 0
0 0 0
DLL - Div Latch Low
Read/Write
LCR[7] = 1
0 0 1
DLM - Div Latch High
Read/Write
LCR[7] = 1
0 0 0
DREV - Device Revision Code
Read-only
DLL, DLM =
0x00
0 0 1
DVID - Device Identification Code
Read-only
DLL, DLM =
0x00
0 0 1
IER - Interrupt Enable Reg
Read/Write
LCR[7] = 0
0 1 0
ISR - Interrupt Status Reg
FCR - FIFO Control Reg
Read-only
Write-only
0 1 1
LCR - Line Control Reg
Read/Write
1 0 0
MCR - Modem Control Reg
Read/Write
1 0 1
LSR - Line Status Reg
Reserved
Read-only
Write-only
1 1 0
MSR - Modem Status Reg
Reserved
Read-only
Write-only
1 1 1
SPR - Scratch Pad Reg
Read/Write
E
NHANCED
R
EGISTERS
0 1 0
EFR - Enhanced Function Reg
Read/Write
LCR = 0xBF
1 0 0
Xoff-1 - Xoff Character 1
Read/Write
LCR = 0xBF
1 0 1
Xoff-2 - Xoff Character 2
reserved
Read/Write
LCR = 0xBF
1 1 0
Xon-1 - Xon Character 1
reserved
Read/Write
LCR = 0xBF
1 1 1
Xon-2 - Xon Character 2
reserved
Read/Write
LCR = 0xBF
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