參數(shù)資料
型號(hào): SC16C754BIA68,518
廠商: NXP Semiconductors
文件頁(yè)數(shù): 9/50頁(yè)
文件大?。?/td> 0K
描述: IC UART QUAD W/FIFO 68-PLCC
產(chǎn)品培訓(xùn)模塊: Stand-Alone UARTs
標(biāo)準(zhǔn)包裝: 1
通道數(shù): 4,QUART
FIFO's: 64 字節(jié)
電源電壓: 2.5V,3.3V,5V
帶自動(dòng)流量控制功能:
帶故障啟動(dòng)位檢測(cè)功能:
帶調(diào)制解調(diào)器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 68-LCC(J 形引線)
供應(yīng)商設(shè)備封裝: 68-PLCC
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面: 828 (CN2011-ZH PDF)
其它名稱: 568-2050-6
SC16C754B_4
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 04 — 6 October 2008
17 of 51
NXP Semiconductors
SC16C754B
5 V, 3.3 V and 2.5 V quad UART, 5 Mbit/s (max.) with 64-byte FIFOs
6.6 DMA operation
There are two modes of DMA operation, DMA mode 0 or DMA mode 1, selected by
FCR[3].
In DMA mode 0 or FIFO disable (FCR[0] = 0) DMA occurs in single character transfers. In
DMA mode 1, multi-character (or block) DMA transfers are managed to relieve the
processor for longer periods of time.
6.6.1 Single DMA transfers (DMA mode 0/FIFO disable)
Figure 11 shows TXRDY and RXRDY in DMA mode 0/FIFO disable.
6.6.1.1
Transmitter
When empty, the TXRDY signal becomes active. TXRDY will go inactive after one
character has been loaded into it.
6.6.1.2
Receiver
RXRDY is active when there is at least one character in the FIFO. It becomes inactive
when the receiver is empty.
Fig 11. TXRDY and RXRDY in DMA mode 0/FIFO disable
TX
wrptr
FIFO EMPTY
TXRDY
RX
rdptr
FIFO EMPTY
RXRDY
002aaa232
at least one
location filled
at least one
location filled
TXRDY
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