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68HC705SP7 Datasheet(PDF) 145 Page - Freescale Semiconductor, Inc

Part # 68HC705SP7
Description  General Release Specification
PDF  230 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705SP7 Datasheet(HTML) 145 Page - Freescale Semiconductor, Inc

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Simple Serial Interface
SIOP Registers
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
General Release Specification
Simple Serial Interface
9.4.3 SIOP Data Register (SDR)
The SIOP data register (SDR) 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 node 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.
Writing to the SDR while a transfer is in progress can cause invalid data
to be transmitted and/or received. Figure 9-6 shows the position of each
bit in the register. This register is not affected by reset.
$000C
Bit 7
654321
Bit 0
Read:
Bit 7
654321
Bit 0
Write:
Reset:
Unaffected by Reset
Figure 9-6. SIOP Data Register (SDR)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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