HM530281R datasheet(10/47 Pages) HITACHI

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Datasheet Title

WLRS (write line reset) Input (in 2 dimensional addressing mode): WLRS is an input pin for resetting

the write address pointer to the start of the line from an arbitrary dot for each line.

Only the falling edge

of this signal is detected, and, on the first WCK cycle following that falling edge, the write address pointer

is set to the head of the next line when WRS is high, and to head of the current line when WRS is low.

RLRS (read line reset) Input (in 2 dimensional addressing mode): RLRS is an input pin for resetting

the read address pointer to the start of the line from an arbitrary dot for each line.

Only the falling edge of

this signal is detected, and, on the first RCK cycle following that falling edge, the write address pointer is

set to the head of the next line when RRS is high, and to head of the current line when RRS is low.

WWND (write window scan) Input (in 2 dimensional addressing mode): WWND is an input signal

that specifies the use of the window scan function. When executing a write jump with WRS and WAS low,

if WWND is set low at the same time, a scan of the window region that takes that write jump address as its

starting point will begin (see note below).

RWND (read window scan) Input (in 2 dimensional addressing mode): RWND is an input signal that

specifies the use of the window scan function. when executing a read jump with RRS and RAS low, if

RWND is set low at the same time, a scan of the window region that takes that read jump address as its

starting point will begin.

WCLR (write clear) Input: WCLR is an input signal that, independently of the levels on WRS, WAS,

WLRS and WWND resets the write address pointer to 0 and clears the window scan function. This

function is executed immediately in the WCK cycle in which WCLR was set low. This clear operation

should also be performed after applying power to the HM530281R.

RCLR (read clear) Input: RCLR is an input signal that, independently of the levels on RRS, RAS, RLRS

and RWND resets the read address pointer to 0 and clears the window scan function. This function is

executed immediately in the RCK cycle in which RCLR was set low. This clear operation should also be

performed after applying power to the HM530281R.

Notes: 1. The reset destination in window scan mode changes as follows.

Reset to 0: Reset to the window start.

Reset to line start: Reset to the point at the left edge of the window for the line

Addressing Mode

Address Structure

Input Address

1 dim. add. (FIFO)

0 to 10,367 blocks

Address bits A

13 to A0

2 dim. add. (1)

32 horizontal blocks by 324 vertical lines

Line address bits V

8 to V0,

horizontal address bits H

4 to H0

2 dim. add. (2)

36 horizontal blocks by 288 vertical lines. Line address bits V

8 to V0,

horizontal address bits H

5 to H0

3. When window scan mode is set, the reset is to the point at the left edge of the window for the

line.

4. When window scan is set, the horizontal address of the pointer reset destination when

increment/hold is executed will be the left edge of the window. Also, when a reset is executed,

the pointer will be reset to the starting point of the window.

Thus it is possible to scan arbitrary window regions within the screen independently for read

and write by using these line reset and reset functions.

HM530281R Datasheet(PDF) 10 Page - Hitachi Semiconductor

HM530281R Datasheet(HTML) 10 Page - Hitachi Semiconductor

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