ISP1130DL Philips Semiconductors, ISP1130DL Datasheet - Page 35

• Manufacturer Part Number: ISP1130DL
• Description: Universal Serial Bus compound hub with integrated keyboard controller
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 06895
Objective specification
10.2.2 Program memory
10.3 Special function registers (SFRs)
The ISP1130 has 8 kbytes of masked ROM for storing the 80C51 operating software.
In order to protect the ROM against illegal copying, execution of a MOVC instruction
from external code memory has been blocked. Instead of reading the program
memory, it accesses the on-chip data memory.
The SFRs of the 80C51 can only be directly addressed. The memory map is given in
Table
width
•
•
•
Fig 5. Data memory organization.
Fig 6. Program memory organization.
SFRs (80H to FFH): direct addressing
4 register banks (00H to 1FH): direct addressing; only 1 register bank may be
enabled at any time
Bit-addressable locations (20H to 2FH): direct addressing; these 16 bytes can
be used as 128 bit-addressable locations.
47.
handbook, halfpage
Rev. 01 — 23 March 2000
FFH
80H
7FH
20H
00H
ADDRESSING
ADDRESSING
INDIRECT
INDIRECT
DIRECT &
1FFFH
Data Memory Space
0000H
USB compound hub with keyboard controller
USER ROM
ON-CHIP
8 kbytes
4 BANKS OF R0 to R7
MGS800
ADDRESSING
DIRECT
ONLY
SFRs
© Philips Electronics N.V. 2000. All rights reserved.
MGS799
ISP1130
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