參數(shù)資料
型號(hào): MC68HC05C9A
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數(shù): 81/160頁
文件大小: 783K
代理商: MC68HC05C9A
Serial Communications Interface (SCI)
SCI I/O Registers
MC68HC05C9A
Rev. 4.0
General Release Specification
MOTOROLA
Serial Communications Interface (SCI)
81
L
G
R
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
6
5
4
3
2
1
Bit 0
Read:
R8
T8
M
WAKE
Write:
Reset:
U
U
0
U
U
0
0
0
= Unimplemented
U = Undetermined
Figure 9-9. SCI Control Register 1 (SCCR1)
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