7220 datasheet(103/303 Pages) RENESAS

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7220 Group User’s Manual

FUNCTIONAL DESCRIPTION

2.11 CRT display function

Fig. 2.11.6 Vertical position register n (addresses 00E116 and 00E216)

Fig. 2.11.7 Horizontal position register (address 00E016)

The vertical position can specify 128-step positions (4 scanning lines per step) for each block by setting

values “0016” to “7F16” to bits 0 to 6 of the vertical position registers (the blocks 1 and 2 are assigned to

addresses to 00E116, 00E216 respectively). Figure 2.11.6 shows the vertical position registers.

The horizontal direction is common to both blocks, and can specify 64-step display positions (4 TC per step,

TC: oscillation cycle for display) by setting values “0016” to “3F16” to bits 0 to 5 of the horizontal position

Figure 2.11.7 shows the horizontal position register.

b7 b6 b5 b4 b3 b2 b1 b0

Vertical position register n (CV1,CV2) (n = 1 and 2) [Addresses 00E116, 00E216]

Name

Functions

After reset

R W

Vertical Position Register n

Vertical display start positions

128 steps (0016 to 7F16)

Indeterminate

(CV1 : CV10 to CV16)

Nothing is assigned. This bit is a write disable bit.

When this bit is read out, the value is “0.”

(CV2 : CV20 to CV26)

R—

b7 b6 b5 b4 b3 b2 b1 b0

Horizontal position register (HR) [Address 00E016]

Name

Functions

After reset

Horizontal Position Register

6, 7

Horizontal display start

positions (HR0 to HR5)

64 steps (0016 to 3F16)

Nothing is assigned. These bits are write disable bits.

When thses bits are read out, the values are “0.”

R—

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