DS80C400 Maxim, DS80C400 Datasheet - Page 71

• Manufacturer Part Number: DS80C400
• Description: The DS80C400 network microcontroller offers the highest integration available in an 8051 device
• Manufacturer: Maxim

DS80C400 ROM Initialization Code
The 80C400 firmware automatically executes Initialization Code (ROM_Init) to generate the memory map as shown
in
Enables 24-bit contiguous address mode
Logically relocates ROM to addresses FF0000h–FF7FFFh
Enables CE0–3, 2MB/chip enable
Enables PCE0–3
Enables CE4–7, 1M/peripheral chip enable
Merged program/data CE0–3, relocate internal XRAM
Enables extended 1kB stack option
Configure to maximum MOVX stretch value
Configure UARTs for Mode 1 serial operation
Figure 13. Memory Map Following Execution of ROM_Init
Figure 13
and configure the DS80C400 hardware as follows:
ROM
program
INTERNAL MEMORY
CAN/BCU XRAM
data
00FFFFh
FFDB00h
FF0000h
71 of 97
FFFFFFh -
E00000h -
C00000h -
A00000h -
000000h -
800000h -
200000h -
600000h -
400000h -
DATA INACCESSIBLE
merged program/data space
64kB SRAM REQUIRED
EXTERNAL MEMORY
(ACON.1:0 = 11b)
(ACON.5 =1)
(P4CNT = 2Fh)
(P5CNT = 07h)
(P6CNT = 27h)
(MCON = AFh)
(ACON.2 = 1)
(CKCON.2:0 = 111b)
CE7
CE6
CE5
CE4
CE3
CE2
CE1
CE0
PROGRAM
INACCESSIBLE