参数资料
型号: MC68HCL05C9AFB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 141/160页
文件大小: 4128K
代理商: MC68HCL05C9AFB
Serial Communications Interface (SCI)
SCI I/O Registers
MC68HC05C9A Rev. 4.0
General Release Specification
Serial Communications Interface (SCI)
NON-DISCLOSURE
AGREEMENT
REQUIRED
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
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
WAKE — Wakeup Method
This read/write bit determines which condition wakes up the SCI: a
logic one (address mark) in the most significant bit (MSB) position of
a received character or an idle condition on the PD0/RDI pin. Resets
have no effect on the WAKE bit.
1 = Address mark wakeup
0 = Idle line wakeup
$000E
Bit 7
6543
2
1
Bit 0
Read:
R8
T8
M
WAKE
Write:
Reset:
U
0
U
0
= Unimplemented
U = Undetermined
Figure 9-9. SCI Control Register 1 (SCCR1)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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