参数资料
型号: MC68HC705C9AFB
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封装: 10 X 10 MM, QFP-44
文件页数: 173/177页
文件大小: 1941K
代理商: MC68HC705C9AFB
Serial Communications Interface (SCI)
SCI I/O Registers
MC68HC705C9A — Rev. 4.0
Advance Information
MOTOROLA
Serial Communications Interface (SCI)
95
9.14.2 SCI Control Register 1
The SCI control register 1 (SCCR1), shown in Figure 9-9, has these
functions:
Stores ninth SCI data bit received and ninth SCI data bit
transmitted
Controls SCI character length
Controls SCI wakeup method
R8 — Bit 8 (Received)
When the SCI is receiving 9-bit characters, R8 is the ninth bit of the
received character. R8 receives the ninth bit at the same time that the
SCDR receives the other eight bits. Resets have no effect on the R8
bit.
T8 — Bit 8 (Transmitted)
When the SCI is transmitting 9-bit characters, T8 is the ninth bit of the
transmitted character. T8 is loaded into the transmit shift register at
the same time that the SCDR is loaded into the transmit register.
Resets have no effect on the T8 bit.
M — Character Length Bit
This read/write bit determines whether SCI characters are 8 bits long
or 9 bits long. The ninth bit can be used as an extra stop bit, as a
receiver wakeup signal, or as a mark or space parity bit. Resets have
no effect on the M bit.
1 = 9-bit SCI characters
0 = 8-bit SCI characters
$000E
Bit 7
6543
2
1
Bit 0
Read:
R8
T8
M
WAKE
Write:
Reset:
U
0
U
000
= Unimplemented
U = Undetermined
Figure 9-9. SCI Control Register 1 (SCCR1)
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