SDA6000 Datasheet, PDF (312/380 Pages) Infineon Technologies AG – Teletext Decoder with Embedded 16-bit Controller

SDA 6000
10.6
Register Description
Display Generator
10.6.1 Special Function Registers
The display generator is controlled by 3 special function registers and a list of accelerator
instructions. Two of the registers define the position and the length of the instruction list,
and one register is used for general control of the DG. After the list of instructions (GAIs)
is written to the memory, the start address and the length of this list must be written to
special function registers GPRGCRH and GPRGCRL. Then the controller commands
the GA to execute these instructions (see SFR DGCON). After the GA has finished
executing all GAIs, the GA gives the controller an interrupt (GAFIR).
Note: GPRGCRH, GPRGCRL and DGCON are the only special function registers to
control the display generator. GAIs described in the next paragraph are stored in
the RAM and not defined after power on.
GPRGCRH
Reset Value: 0000_H
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
GCR (8..0)
GPR (23..17)
rw
rw
Bit
Function
GCR
Defines the amount of GAIs in the instruction list.
(8 … 0) GCR × 4 is the length of the GAI area in count of bytes.
Note: After the last instruction is executed an interrupt is given to the
controller
GPR
Define the MSBs of the 23-bit address pointer to the start of the GAI
(23 … 17) area.
GPRGCRL
Reset Value: 0000_H
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
GPR (16..1)
rw
Bit
Function
GPR Define the LSBs of the 23-bit address pointer to the start of the GAI
(16 … 1) area.
DGCON is for general control of the DG.
Users Manual
10 - 27
2000-06-15