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C8051F54X Datasheet(PDF) 89 Page - Silicon Laboratories

Part No. C8051F54X
Description  Mixed Signal ISP Flash MCU Family
Download  276 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

C8051F54X Datasheet(HTML) 89 Page - Silicon Laboratories

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C8051F54x
88
Rev. 1.1
the DPTR can be accessed through the SFR registers DPH, which contains the upper 8-bits of DPTR, and
DPL, which contains the lower 8-bits of DPTR.
11.3.2. 8-Bit MOVX Example
The 8-bit form of the MOVX instruction uses the contents of the EMI0CN SFR to determine the upper 8-bits
of the effective address to be accessed and the contents of R0 or R1 to determine the lower 8-bits of the
effective address to be accessed. The following series of instructions read the contents of the byte at
address 0x1234 into the accumulator A.
MOV
EMI0CN, #12h
; load high byte of address into EMI0CN
MOV
R0, #34h
; load low byte of address into R0 (or R1)
MOVX
a, @R0
; load contents of 0x1234 into accumulator A
SFR Address = 0xAA; SFR Page = 0x00
SFR Definition 11.1. EMI0CN: External Memory Interface Control
Bit
7
6
5
4
3
2
1
0
Name
PGSEL[7:0]
Type
R/W
Reset
0
0
0
0
0
0
0
0
Bit
Name
Function
7:0 PGSEL[7:0] XRAM Page Select Bits.
The XRAM Page Select Bits provide the high byte of the 16-bit external data memory
address when using an 8-bit MOVX command, effectively selecting a 256-byte page of
RAM.
0x00: 0x0000 to 0x00FF
0x01: 0x0100 to 0x01FF
...
0xFE: 0xFE00 to 0xFEFF
0xFF: 0xFF00 to 0xFFFF


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