HC705P6AGRSSLASHD datasheet(63/134 Pages) NXP

Part #	HC705P6AGRS/D

Description	The Motorola MC68HC705P6A is an EPROM version of the MC68HC05P6 microcontroller

PDF	134 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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63 / 134 page

General Release Specification

SIOP Registers

MC68HC705P6A — Rev. 1.0

General Release Specification

Serial Input/Output Port

7.4.3 SIOP Data Register (SDR)

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 7-5 shows the position of each bit in the register. This register is

not affected by reset.

$000C

Bit 7

654321

Bit 0

Read:

SD7

SD6

SD5

SD4

SD3

SD2

SD1

SD0

Write:

Reset:

Unaffected by reset

Figure 7-5. Serial Port Data Register (SDR)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705P6AGRS/D Datasheet(PDF) 63 Page - NXP Semiconductors