UPD17062 datasheet(278/298 Pages) RENESAS

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276

µPD17062

21.3

HSYNC COUNTER (HSC)

The HSYNC counter is mapped at peripheral address 04H. It is a 6-bit read-only binary counter. It can be

read-accessed through the data buffer using the GET instruction.

When it overflows, the 6-bit HSYNC counter goes back to 00H.

The HSYNC counter is reset to 00H at a power-on reset and clock stop.

(1) Gate open bit (HSCGOSTT)

The HSCGOSTT is mapped at the MSB (b3) of the register file at 12H. It is always high when the gate with

the Hsync input is open. Note that when the 1.69 ms gate mode is selected, the HSCGOSTT becomes high

when the input data is set even if there is no gate clock.

21.4

EXAMPLE OF USING THE HORIZONTAL SYNC SIGNAL

The following example is a program that uses the horizontal sync signal counter.

When the 1.69 ms gate is open

CLR1

P0BBIO3

; Sets P0B3 in input mode.

PEEK

WR, 0B6H

AND

WR, #0111B

POKE

0B6H, WR

LOOP:

PEEK

WR, #92H

; Makes sure that the gate is closed once.

SKF

WR, #1000B

LOOP

;

MOV

WR, #0010B

; Selects the 1.69 ms gate mode.

POKE

91H, WR

LOOP2:

PEEK

WR, #92H

; Makes sure that the gate is closed.

SKF

WR, #1000B

LOOP2

GET

DBF, HSC

; Reads the content of the HSYNC counter.

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