參數(shù)資料
型號: MC68HC05P18A
廠商: Motorola, Inc.
英文描述: Low Cost HCMOS Microcontroller(低成本、8位HCMOS微控制器)
中文描述: 低成本HCMOS微控制器(低成本,8位HCMOS微控制器)
文件頁數(shù): 83/130頁
文件大?。?/td> 1200K
代理商: MC68HC05P18A
Serial Input/Output Ports (SIOP)
SIOP Registers
MC68HC05P18A
Technical Data
MOTOROLA
Serial Input/Output Ports (SIOP)
83
L
G
R
9.4.3 SIOP Data Register
This register is located at address $000C and serves as both the
transmit and receive data register. Writing to this register will initiate a
message transmission if the SIOP is in master mode. The SIOP
subsystem is not double buffered and any write to this register will
destroy the previous contents. The SDR can be read at any time;
however, if a transfer is in progress, the results may be ambiguous and
the DCOL bit will be set. Writing to the SDR while a transfer is in
progress can cause invalid data to be transmitted and/or received.
Figure 9-5
shows the position of each bit in the register. This register is
not affected by reset.
Address:
$000C
Bit 7
6
5
4
3
2
1
Bit 0
Read:
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
Write:
Reset:
Unaffected by reset
Figure 9-5. SIOP Data Register (SDR)
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