參數(shù)資料
型號(hào)： MC68HC05C0FN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 4 MHz, MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 75/96頁(yè)
文件大?。?/td> 357K
代理商： MC68HC05C0FN
MOTOROLA
Section 12: Serial Communications Interface
Page 68
MC68HC05C0 Specification Rev. 1.2
Figure 12-6: SCI Start Bit Following a Break
12.5
TRANSMITTER
This section describes the transmit data out and the synchronous transmit capability.
12.5.1
TRANSMIT DATA OUT
Transmit data out (TDO) is the serial data which is transferred from the transmit data
register (TDR) via the SCI to the output pin. The data format is shown in Figure 12-1.The
transmitter generates a bit time by using a derivative of the RT clock, thus producing a
transmission rate equal to one-sixteenth that of the receiver sample clock (assuming the
same baud rate is selected for both receiver and transmitter).
12.5.2
SCI SYNCHRONOUS TRANSMISSION
The SCI transmitter allows a one-way synchronous transmission. The SCK pin is the clock
output of the SCI transmitter. The SCK pin is inactive when the transmitter is sending start
and stop bits. In addition, the SCK pin is inactive during idle, preamble, and send break
conditions.
The LBCL bit in SCCR1 controls whether or not the SCK clock is active during the last valid
data bit (address mark). The CPOL bit in SCCR1 selects the SCK clock polarity, and the
CPHA bit in SCCR1 selects the phase. See Figure 12-9 : SCI Data Clock Timing
information.
These options allow the SCI to control serial peripherals which consist of shift registers,
without losing any functionality of the SCI transmitter. These options do not affect the SCI
receiver, which is independent of the transmitter.
NOTE:
The LBCL, CPOL, and CPHA bits must be selected before the transmitter
is enabled to ensure that the clocks function correctly. In addition, these
bits should only be changed with the transmitter disabled.
RECEIVE
DATA IN
BREAK
EXPECTED STOP
DATA SAMPLES
START
QUALIFIERS
START BIT
{
START
VERIFICATION
DETECTED AS
VALID START
EDGE
(1 RT INTERVAL) (2 RT INTERVAL)
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