M68ICS08GR datasheet(264/408 Pages) FREESCALE

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Serial Communications Interface (SCI)

Technical Data

MC68HC908GR8 — Rev 4.0

264

Serial Communications Interface (SCI)

MOTOROLA

18.9.5 SCI Status Register 2

SCI status register 2 contains flags to signal the following conditions:

•

Break character detected

•

Incoming data

BKF — Break Flag Bit

This clearable, read-only bit is set when the SCI detects a break

character on the PE1/RxD pin. In SCS1, the FE and SCRF bits are

also set. In 9-bit character transmissions, the R8 bit in SCC3 is

cleared. BKF does not generate a CPU interrupt request. Clear BKF

by reading SCS2 with BKF set and then reading the SCDR. Once

cleared, BKF can become set again only after logic 1s again appear

on the PE1/RxD pin followed by another break character. Reset

clears the BKF bit.

1 = Break character detected

0 = No break character detected

RPF — Reception in Progress Flag Bit

This read-only bit is set when the receiver detects a logic 0 during the

RT1 time period of the start bit search. RPF does not generate an

interrupt request. RPF is reset after the receiver detects false start bits

(usually from noise or a baud rate mismatch) or when the receiver

detects an idle character. Polling RPF before disabling the SCI

module or entering stop mode can show whether a reception is in

progress.

1 = Reception in progress

0 = No reception in progress

Address:

$0017

Bit 7

654321

Bit 0

Read:

BKF

RPF

Write:

Reset:

00000000

= Unimplemented

Figure 18-14. SCI Status Register 2 (SCS2)

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