參數(shù)資料
型號(hào): XR88C681P/40
廠商: Exar Corporation
文件頁(yè)數(shù): 49/101頁(yè)
文件大?。?/td> 0K
描述: IC UART CMOS DUAL 40PDIP
產(chǎn)品變化通告: Leaded UART, V&I Obsolescence 11/Apr/2011
標(biāo)準(zhǔn)包裝: 9
特點(diǎn): *
通道數(shù): 2,DUART
FIFO's: 1 字節(jié),3 字節(jié)
電源電壓: 4.75 V ~ 5.25 V
帶并行端口:
帶CMOS:
安裝類(lèi)型: 通孔
封裝/外殼: 40-DIP(0.600",15.24mm)
供應(yīng)商設(shè)備封裝: 40-PDIP
包裝: 管件
XR88C681
51
Rev. 2.11
Preset Registers
(CTUR, CTLR)
Counter/
Timer
32:1
MUX
TxCA
32:1
MUX
RxCA
32:1
MUX
TxCB
32:1
MUX
RxCB
IP2
(RXCB)
IP5
(TXCB)
IP4
(RXCA)
IP3
(TXCA)
IP2
Divide by 16
TXCA
TXCB
ACR[4-6]
Bit Rate
Generator
ACR[7]
Oscillator
Circuit
X1/CLK
X2
Divide by 16
Figure 24. Block Diagram of DUART Timing Control Block
Each element of the Timing Control Block is discussed
here:
D.1 Oscillator Circuit:
A crystal oscillator is typically connected externally
across the X1/CLK and X2 pins. The Oscillator Circuit
(within the chip) functions as the load for the resonant
(crystal) oscillator, and buffers the resulting oscillating
signal, for use by the Bit Rate Generator, and
Counter/Timer. A crystal or TTL signal frequency of
between 2 MHz and 4 MHz is required for proper
operation of the DUART. However, a crystal or TTL signal
frequency of 3.6864 MHz is required for the generation of
standard bit rates by the Bit Rate Generator (See
Table 18).
Figure 25 presents a recommended
schematic for the XTAL Oscillator circuitry.
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