User Manual

2. Operation Principles
2.1 System Mapping
2.1.1 Address Mapping of the 7521(D)
Device Address mapping
Flash ROM 256K: from C000:0000 to F000: FFFF
SRAM 128K: from 0000:0000 to 1000:FFFF
COM1 BASE 0XFF80 to 0XFF88
COM2 BASE 0XFF10 to 0XFF18
Interrupt No. Interrupt mapping
0 Divided by zero
1 Trace
2 NMI
3 Break point
4 Detected overflow exception
5 Array bounds exception
6 Unused opcode exception
7 ESC opcode exception
8 Timer 0
9 Reserved
0A DMA-0
0B DMA-1
0C \INT0 of I/O expansion bus
0D \INT1 of I/O expansion bus
0E-10 Reserved
11 COM2
12 Timer 1
13 Timer 2
14 COM1
7521/2/2A/3/4/7 Series Hardware User’s Manual, Ver. 1.5 Sep/2002, 7Mh-001-15 -----44