ST6391 datasheet(50/68 Pages) STMICROELECTRONICS

50 / 68 page

D6. This bit is fixed to “0”.

C5-C0. Character type. The 6 character type bits

define one of the 64 available character types.

These character types are shown on the following

pages.

Character Types

The character set is user defined as ROM mask

option.

The OSD contains seven registers and 80 RAM lo-

cations. The seven registers are the Vertical Start

Address register, Horizontal Start Address regis-

ter, Vertical Space register, Horizontal Space reg-

ister, Background Control register, Global Enable

Global Enable register can be written at any time

by the ST639x Core. The other six registers and

the RAM can only be read or written to if the global

enable is zero.

The six registers and the RAM are located on two

pages of the paged memory of the ST639x MCUs;

the Character Bank Select register is located out-

side the paged memory at address EDh. Each

page contains 64 memory locations. This paged

memory is at memory locations 00h to 3Fh in the

ST639x memory map. A page of memory is en-

abled by setting the desired page bit, located in the

Data Ram Bank Register, to a one. The page reg-

ister is location E8h. A one in bit five selects page

5, located on the OSD and a one in bit 6 selects

page 6 on the OSD. Table 12 shows the addresses

of the OSD registers and RAM.

Table 12. OSD Control Registers and Data

RAM Addressing

Page

Address

00h - 3Fh

RAM Locations 00h - 3Fh

00h - 0Fh

RAM Locations 00h - 0Fh

10h

Vertical Start Register

11h

Horizontal Start Register

12h

Vertical Space Register

13h

Horizontal Space Register

14h

Background Control Register

17h

Global Enable Register

Page

EDh

Character Bank Select Register

OSD Global Enable Register

This register contains the global enable bit (GE). It

is the only register that can be written at any time

regardless of the state of the GE bit. It is a write

only register.

D7-D1. These bits are not used

GE. Global Enable. This bit allows the entire dis-

play to be turned off.

“0” - The entire display is disabled. The RAM and

other registers of the OSD can be accessed by

the Core.

“1” - Display of words is controlled by the word en-

able bits (WE) located in the format or space

character. The other registers and RAM can-

not be accessed by the Core.

ON-SCREEN DISPLAY (Continued)

Display Character

See Data RAM Table Description

for specific Addresses

( Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

C5-C0 = Character Types

control Bit

Fixed to “0”

Unused

Figure 58. Display Character Register

Explanation

Global Enable

17h - Page 6

( Write Only)

D7 D6 D5 D4 D3 D2 D1 D0

GE = Global Enable Bit

Unuse d

Figure 59. Global Enable Bit

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