SDA5252 SIEMENS [Siemens Semiconductor Group], SDA5252 Datasheet - Page 62

• Manufacturer Part Number: SDA5252
• Description: TVTEXT 8-Bit Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
Table 13
Special Function Register Overview (cont’d)
Special Function Register
Description
Display Control Registers
Horizontal Delay
Vertical Delay
Transparent Control
Mode 1 Register
Mode 2 Register
Sync Interrupt Request Reg.
Language Control
Cursor Column Position
Cursor Row Position
Display Timing Control
Sandcastle Control
Display Mode
6.3.3
External events and the real-time on-chip peripherals require CPU-service
asynchronous to the execution of any particular section of code. To couple the
asynchronous activities of these functions to normal program execution, a sophisticated
multiple-source, four-priority-level, nested interrupt system is provided. Interrupt
response delay ranges from 0,89 s to 2.33 s when using an 18-MHz clock (see
Chapter “Advanced Function Register” on page 115).
6.3.3.1
The processor acknowledges interrupt requests from seven sources: two from external
sources via the INT0 and INT1 pins, one from each of the two internal counters, one from
the serial I/O-port, one from teletext sync signals and one from the analog digital
converter. Each of the seven sources can be assigned to either of four priority levels and
can be independently enabled and disabled. Additionally, all enabled sources can be
globally disabled or enabled.
Interrupts result in a transfer of control to a new program location. Each interrupt vectors
to a separate location in program memory for its service program. The program servicing
the request begins at this address. The starting address (interrupt vector) of the interrupt
service program for each interrupt source is shown in the Table 14.
Interrupt System
Interrupt Sources
Symbolic
Name
DHD
DVD
DTCR
DMODE1
DMODE2
TTXSIR
LANGC
DCCP
DCRP
DTIM
SCCON
DMOD
Address
Location
(hex.)
C3
C4
C5
C6
C7
C8
C9
CA
CB
CC
CE
D6
62
Address
Location
(dec.)
195
196
197
198
199
200
201
202
203
204
206
214
Bit Address
MSB … LSB
(hex.)
–
–
–
–
–
CF - C8
–
–
–
–
–
–
SDA 525x
Initial
Value after
Reset
(hex./bin.)
00
00
00
00
00
00
00
00
00
00
00
x0
1998-04-08