STV9432

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6.3 - ADDRESSING SPACE

6.3.1 - General Mapping

STV9432 registers, RAM and ROM are mapped in a 32K address space.

The mapping is:

Important Notice:

All 16 bits datas are mapped LSB byte at lower address and MSB byte at higher address.

– Example: H1 12 bits register: @4000: 8 LSB bits - @4001: 4 MSB bits.

– Descriptors must also be written to RAM LSB byte first.

0000

03FF

1024 bytes RAM

Descriptors and character codes

0400

07FF

Empty Space

0800

3FFF

Character Generator ROM

4000

403F

Internal Registers

4040

7FFF

Empty Space

4000

H1 LSB

4022

Color 2

4001

H1 MSB

4023

Color 3

4002

H2 LSB

4024

Color 4

4003

H2 MSB

4025

Color 5

4004

H3 LSB

4026

Color 6

4005

H3 MSB

4027

Color 7

4006

H4 LSB

4028

Color 8

4007

H4 MSB

4029

Color 9

4008

H5 LSB

402A

Color 10

4009

H5 MSB

402B

Color 11

400A

H6 LSB

402C

Color 12

400B

H6 MSB

402D

Color 13

400C

V1 LSB

402E

Color 14

400D

V1 MSB

402F

Color 15

400E

V2 LSB

4030

Line Duration

400F

V2 MSB

4031

Top Margin

4010

V3 LSB

4032

Horizontal Delay

4011

V3 MSB

4033

Character Height

4012

4034

Display Control

4013

4035

Locking Time Constant

4014

4036

Capture Time Constant

4015

SBN

4037

Initial Pixel Period

4016

TIMG

4038-403E

Reserved

4017-401F

Reserved

403F

RST

4020

Color 0

4040-7FFF

Reserved

4021

Color 1