参数资料
型号: MC68HC705PD6
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封装: QFP-80
文件页数: 18/165页
文件大小: 841K
代理商: MC68HC705PD6
GENERAL RELEASE SPECIFICATION
July 7, 1997
MOTOROLA
SERIAL COMMUNICATIONS INTERFACE
MC68HC05PD6
11-12
REV 1.1
be set, but not the framing error bit, and the byte will not be transferred to the
serial communications data register. The FE bit is cleared when the serial
communications status register is accessed (with FE set) followed by a read of
the serial communications data register. Reset clears the FE bit.
11.9.5 Baud Rate Register
The baud rate register provides the means for selecting different baud rates which
may be used as the rate control for the transmitter and receiver. The SCP0-SCP1
bits function as a prescaler for the SCR0-SCR2 bits. Together, these ve bits
provide multiple, baud rate combinations for a given internal processor clock
frequency.
SCP0, SCP1
These two bits in the baud rate register are used as a prescaler to increase the
range of standard baud rates controlled by the SCR0-SCR2 bits. A table of the
prescaler internal processor clock division versus bit levels is provided below.
Reset clears SCP1-SCP0 bit (divide-by-one).
SCR2, SCR1, SCR0
These three bits in the baud rate register are used to select the baud rates of
both the transmitter and receiver. A table of baud rates versus bit levels is
shown below. Reset does not affect the SCR2-SCR0 bits.
The diagram of Figure 11-7 and Table 11-1 and Table 11-2 illustrate the divided
chain used to obtain the baud rate clock (transmit clock). Note that there is a xed
rate divide-by-16 between the receive clock (RT) and the transmit clock (Tx). The
actual divider chain is controlled by the combined SCP0-SCP1 and SCR0-SCR2
bits in the baud rate register as illustrated. All divided frequencies shown in the
rst table represent the nal transmit clock (the actual baud rate) resulting from
the internal processor clock division shown in the “divide-by” column only
SCP1
SCP0
INTERNAL PROCESSOR CLOCK
DIVIDE BY
00
1
01
3
10
4
11
13
0
7
0000
U
6543210
W
R
SCBRR
$000A
reset
SCP1
SCP0
SCR2
SCR1
SCR0
0
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