СРС308 Processor Module
The Module Structure and Functioning
C P C 3 0 8 U s e r M a n u a l
© 2 0 1 3 F a s t w e l V e r . 0 0 1 b E
46
HL1 green
User LEDs
HL2 yellow
Note
See the description of LED1 and LED2 user LEDs programming in
subsection 6.3.
3.6
Watchdog Timers
The CPC308 module is equipped with two watchdog timers. One of them (WDT1) is built into
the supervisor microchip and has a fixed timeout period (1.6 s), the other is built into the SIO
microchip; its timeout period is programmable (up to 255 min).
Note
See the description of the watchdog timers programming in
subsection 6.
3.7
The Module Address Space
3.7.1
Distribution of the Memory Address Space
The distribution of the module memory address space is shown in the table below:
Table 3
-
20: Distribution of the Memory Address Space
Address range
Size
Description
00000h
– 9FFFFh
640 Kbytes
Random-access memory
A0000h
– BFFFFh
128 Kbytes
Video memory
C0000h
– С7FFFh
32 Kbytes
BIOS video memory
C8000h
– СBFFFh
16 Kbytes
BIOS video memory / external bus memory
CC000h - CFFFFh
16 Kbytes
Reserved
D0000h
– D3FFFh
16 Kbytes
Reserved
D4000h
– D7FFFh
16 Kbytes
Reserved / ISA external bus memory
D8000h
– DBFFFh
16 Kbytes
Reserved / ISA external bus memory
DC000h - DFFFFh
16 Kbytes
Reserved / ISA external bus memory
E0000h
– EFFFFh
65 Kbytes
BIOS POST
F0000h
– FFFFFh
65 Kbytes
ROM BIOS