参数资料
型号: MC68HC05C9EFB
厂商: MOTOROLA 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: 125/144页
文件大小: 1628K
代理商: MC68HC05C9EFB
Serial Communications Interface (SCI)
SCI I/O Registers
MC68HC05C9E
Advance Information
MOTOROLA
Serial Communications Interface (SCI)
81
N
O
N-D
I
SC
L
O
SU
R
E
AG
R
EEMENT
R
E
Q
U
IR
ED
9.12.1 SCI Data Register
The SCI data register (SCDR), shown in Figure 9-8, is the buffer for
characters received and for characters transmitted.
9.12.2 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.
Address: $0011
Bit 7
6543
2
1
Bit 0
Read:
SCD7
SDC6
SCD5
SCD4
SCD3
SCD2
SCD1
SCD0
Write:
Reset:
Unaffected by reset
Figure 9-8. SCI Data Register (SCDR)
Address: $000E
Bit 7
6543
2
1
Bit 0
Read:
R8
T8
MWAKE
Write:
Reset:
U
0
U
000
= Unimplemented
U = Undetermined
Figure 9-9. SCI Control Register 1 (SCCR1)
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