68HC705BD7 datasheet(61/85 Pages) FREESCALE

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SECTION 10: SYNC PROCESSOR

Page 51

MC68HC05BD7 Rev. 2.0

GENERAL RELEASE SPECIFICATION

10.3

Registers

There are five registers associated with the SYNC PROCESSOR module as described

below.

10.3.1

Sync Processor Control and Status Register (SPCSR)

NOTE:

Please don’t use BSET or BCLR to manipulate this register when VSIE is

set and I-bit is clear, or it will cuase abnormal reset.

VSIE

bit 7

When VSync Interrupt Enable (VSIE) bit is set, the VSIF flag

is enabled to generate an interrupt request to the CPU. When

VSIE is cleared, the VSIF flag is prevented from generating an

interrupt request. Reset clears this bit.

VEDGE

bit 6

The VEDGE bit specifies the triggering edge of VSYNC

interrupt. When it is zero, the rising edge of internal VSYNC

signal which is either from the VSYNC pin or extracted from

the composite input signal will set VSIF flag. When it is one,

the falling edge of internal VSYNC signal will set VSIF flag.

Reset clears this bit.

VSIF

bit 5

This flag is a read-only bit and is set by the specified edge of

internal VSYNC signal which is either from the VSYNC pin or

extracted from the composite input signal. The triggering

edge is specified by the VEDGE bit, see the above description

of VEDGE for details. It is cleared by writing a zero to it or

reset.

COMP

bit 4

This COMPosite video input enable bit is set to enable the

separator circuit which extracts the VSYNC pulse from

composite input in HSYNC pin. The extracted VSYNC pulse

will be fed into the vertical counter, vertical polarity detection

circuit, and VSYNO output circuit as well. Its measurable

timing is the same as the separate VSYNC pin input. Reset

clears this bit.

VINVO

bit 3

This bit controls the output polarity of the VSYNO signal.

When it is zero, the VSYNO output is identical to the VSYNC

input. When it is one, the inverted VSYNC signal is output to

VSYNO pin.

0000000

6543210

SPCSR

$000C

reset

⇒

VSIF

COMP

VEDGE

VSIE

VPOL

HPOL

HINVO

VINVO

Freescale Semiconductor, Inc.

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