HC805P18GRSSLASHD datasheet(80/111 Pages) NXP

Part #	HC805P18GRS/D

Description	The Motorola MC68HC805P18 microcontroller is a member of the M68HC05

PDF	111 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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80 / 111 page

GENERAL RELEASE SPECIFICATION

SERIAL INPUT/OUTPUT PORT

MC68HC805P18

11-6

11.3.3 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 11-3 shows the position of

each bit in the register. This register is not affected by reset.

Bit 7

654321

Bit 0

SDR

$000C

Read:

SD7

SD6

SD5

SD4

SD3

SD2

SD1

SD0

Write:

Reset:

Unaffected by reset

Figure 11-5. SIOP Data Register

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC805P18GRS/D Datasheet(PDF) 80 Page - NXP Semiconductors