參數(shù)資料
型號(hào): MC68328PV
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP144
封裝: PLASTIC, TQFP-144
文件頁(yè)數(shù): 50/198頁(yè)
文件大小: 551K
代理商: MC68328PV
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Universal Asynchronous Receiver/Transmitter
11-16
MC68328 USER’S MANUAL 12/9/97
MOTOROLA
UART
11
PRELIMINARY
TX DATA—Transmit Data
This field is the parallel transmit data inputs. While in 7-bit mode, D7 is ignored. While in 8-bit
mode, all bits are used. Data is transmitted LSB first. A new character is transmitted when
these bits are written. These bits are read as 0.
11.4.5 UART Miscellaneous Register
The UART miscellaneous (UMISC) register contains miscellaneous bits to control test
features of the UART. Some bits are intended for factory use only and should not be
disturbed.
Bits 8–11 and 15—Reserved
These bits are reserved for factory testing and should remain 0.
CLK SRC—Clock Source
This bit selects the source of the 1x bit clock for transmit and receive. When high, the bit
clock is derived directly from the GPIO pin (it must be configured as an input.) When low,
(normal) the bit clock is supplied by the baud rate generator. This bit allows high-speed
synchronous applications, in which a clock is provided by the external system.
0 = Bit clock generated by baud rate generator.
1 = Bit clock supplied from GPIO (input).
FORCE PERR—Force Parity Error
When this bit is high, it forces the transmitter to generate parity errors if parity is enabled.
This bit is provided for system debugging.
0 = Generate normal parity.
1 = Generate inverted parity (error).
LOOP—Loopback Mode
This bit controls loopback for system-test purposes. When this bit is high, the receiver input
is internally connected to the transmitter, and the RxD pin is ignored. This bit does not affect
the transmitter.
0 = Normal receiver operation.
1 = Internally connect transmitter output to receiver input.
UMISC
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
FIELD
RES
CLK
SRC
FORCE
PERR
LOOP
RESERVED
RTS
CONT
RTS
IRDA
EN
IRDA
LOOP
RX POL TX POL
R/W
R/W
R/W
RESET
0x0000
ADDR
0x(FF)FFF908
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