UPD161622 datasheet(21/103 Pages) NEC

21 / 103 page

Data Sheet S15649EJ2V0DS

µ PD161622

5.2 Display Data RAM

This RAM stores dot data for display and consists of 2,112 bits (132 x 16) x 176 bits. Any address of this RAM can

be accessed by specifying an X address and an Y address.

Display data D0 to D15 transmitted from the CPU corresponds to the pixels on the LCD (refer to Table 5

−5).

Table 5

−5. Display Data RAM

D15

D14

D13

D12

D11

D10

Dot 1

Dot 2

Dot 3

Pixel 1 (= 1 x address)

5.2.1 X address circuit

An X address of the display data RAM is specified by using the X address register as shown in Figure 5

−8.

If the X address increment mode (INC = 0: data access control register: R5) is used, the specified X address is

incremented or decremented by one each time display data is written. Whether the address is incremented or

decremented is specified by the XDIR flag of data access control register (R5) as shown in Table 5

−6.

In the increment mode, the X address is incremented up to 83H. If more display data is written, the Y address is

incremented (YDIR = 0) or decremented (YDIR = 1), and the X address returns to 00H.

In the decrement mode, the X address is decremented to 00H. If more display data is written, the Y address is

incremented (YDIR = 0) or decremented (YDIR = 1), and the X address returns to 83H.

5.2.2 Y address circuit

A Y address of the display data RAM is specified by using the Y address register as shown in Figure 5

−8. If the Y

address increment mode (INC = 1: data access control register: R5) is used, the specified Y address is incremented

or decremented by one each time display is written. Whether the address is incremented or decremented is specified

by the YDIR flag of data access control register (R5) as shown in Table 5

−6.

In the increment mode, the Y address is incremented up to AFH. If more display data is written, the X address is

incremented (XDIR = 0) or decremented (XDIR = 1), and the Y address returns to 00H.

In the decrement mode, the Y address is decremented to 00H. If more display data is written, the X address is

incremented (XDIR = 0) or decremented (XDIR = 1), and the Y address returns to AFH.

The relationship between the setting of INC, XDIR, and YDIR of data access control register (R5) and the address is

as follows:

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