REV. 1.1.1 2.0 FUNCTIONAL DESCRIPTIONS 2.1 CPU Interface The CPU in" />
參數(shù)資料
型號： XR68M752IM48-F
廠商： Exar Corporation
文件頁數(shù)： 2/54頁
文件大?。?/td> 0K
描述： IC UART FIFO 64B DUAL 48TQFP
標準包裝： 250
特點： *
通道數(shù)： 2，DUART
FIFO's： 64 字節(jié)
規(guī)程： RS232，RS422，RS485
電源電壓： 1.62 V ~ 3.63 V
帶自動流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動位檢測功能： 是
帶調制解調器控制功能： 是
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 48-TQFP
供應商設備封裝： 48-TQFP（7x7）
包裝： 托盤
其它名稱： 1016-1479
1016-1479-ND
1016-1642
XR68M752IM48-F-ND
XR16M752/XR68M752
10
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
REV. 1.1.1
2.0 FUNCTIONAL DESCRIPTIONS
2.1
CPU Interface
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The XR16M752 data interface supports the Intel compatible types of CPUs while the
XR68M752 supports both the Intel and Motorola compatible data interfaces. No clock (oscillator nor external
clock) is required to operate a data bus transaction. Each bus cycle is asynchronous using CS#, IOR# and
IOW# signals. Both UART channels share the same data bus for host operations. The data bus
interconnections are shown in Figure 4.
FIGURE 4. XR16M752/XR68M752 DATA BUS INTERCONNECTIONS
VCC
OP2A#
DSRA#
CTSA#
RTSA#
DTRA#
RXA
TXA
RIA#
CDA#
OP2B#
DSRB#
CTSB#
RTSB#
DTRB#
RXB
TXB
RIB#
CDB#
GND
A0
A1
A2
UART_CSA#
UART_CSB#
IOR#
IOW #
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
CSA#
CSB#
D0
D1
D2
D3
D4
D5
D6
D7
IOR #
IOW #
UART
Channel A
UART
Channel B
UART_INTB
UART_INTA
INTB
INTA
RXRDYA#
TXRDYA#
RXRDYA#
TXRDYA#
RXRDYB#
TXRDYB#
RXRDYB#
TXRDYB#
UART_RESET
RESET
Serial Interface of
RS-232, RS-422
or RS-485
Serial Interface of
RS-232, RS-422
or RS-485
(no connect)
2.25 to 3.6 Volt VCC
VCC
OP2A#
DSRA#
CTSA#
RTSA#
DTRA#
RXA
TXA
RIA#
CDA#
OP2B#
DSRB#
CTSB#
RTSB#
DTRB#
RXB
TXB
RIB#
CDB#
GND
A0
A1
A2
UART_CS#
A3
R/W #
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
CSA#
CSB#
D0
D1
D2
D3
D4
D5
D6
D7
IOR #
IOW #
UART
Channel A
UART
Channel B
UART_IRQ#
INTB
INTA
RXRDYA#
TXRDYA#
RXRDYA#
TXRDYA#
RXRDYB#
TXRDYB#
RXRDYB#
TXRDYB#
RESET#
VCC
UART_RESET#
(no connect)
VCC
Intel Data Bus Interconnections
Motorola Data Bus Interconnections
Serial Interface of
RS-232, RS-422
or RS-485
Serial Interface of
RS-232, RS-422
or RS-485
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