DS80C320-MCG Datasheet, PDF (41/175 Pages) Dallas Semiconductor – High-Speed Microcontroller User Guide

ROM Size Select (ROMSIZE)
High-Speed Microcontroller User’s Guide
7
6
5
4
3
2
1
0
SFR C2h
-
-
-
-
-
RS2
RS1
RS0
RT-1
RT-0
RT-1
R=Unrestricted Read, W=Unrestricted Write, -n=Value after Reset
Bits 7-3
ROMSIZE.2-0
Bits 2-0
These bits are reserved. Read data is indeterminate.
ROM Size Select 2-0. This register is used to select the maximum on-chip
decoded address for ROM. Care must be taken that the memory location of the
current program counter will be valid both before and after modification. These
bits can only be modified using a timed access procedure. The EA pin will
override the function of these bits when asserted, forcing the device to access
external program memory only. Configuring this register to a setting that
exceeds the maximum amount of internal memory may corrupt device operation.
These bits will default on reset to the maximum amount of internal program
memory (i.e., 16K for DS87C520).
RS2 RS1 RS0
MAXIMUM ON-CHIP ROM ADDRESS
0
0
0 0KB/Disable on-chip ROM
0
0
1 1KB/03FFh
0
1
0 2KB/07FFh
0
1
1 4KB/0FFFh
1
0
0 8KB/1FFFh
1
0
1 16KB/3FFFh
1
1
0 132KB/7FFFh
1
1
1 64KB/FFFFh
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