71M6531F-IM/F Maxim Integrated Products, 71M6531F-IM/F Datasheet - Page 20

• Manufacturer Part Number: 71M6531F-IM/F
• Description: IC ENERGY METER 256KB 68-QFN
• Manufacturer: Maxim Integrated Products

Specifications of 71M6531F-IM/F

• Mounting Style: SMD/SMT
• Package / Case: QFN-68
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MOVX Addressing
There are two types of instructions differing in whether they provide an 8-bit or 16-bit indirect address to
the external data RAM.
In the first type, MOVX A,@Ri, the contents of R0 or R1 in the current register bank provide the eight
lower-ordered bits of address. The eight high-ordered bits of the address are specified with the PDATA
SFR. This method allows the user paged access (256 pages of 256 bytes each) to all ranges of the
external data RAM.
In the second type of MOVX instruction, MOVX A,@DPTR, the data pointer generates a 16-bit address.
This form is faster and more efficient when accessing very large data arrays (up to 64 KB), since no
additional instructions are needed to set up the eight high ordered bits of the address.
It is possible to mix the two MOVX types. This provides the user with four separate data pointers, two
with direct access and two with paged access, to the entire 64 KB of external memory range.
Dual Data Pointer
The Dual Data Pointer accelerates the block moves of data. The standard DPTR is a 16-bit register that
is used to address external memory or peripherals. In the 80515 core, the standard data pointer is called
DPTR, the second data pointer is called DPTR1. The data pointer select bit, located in the LSB of the DPS
register (DPS[0]), chooses the active pointer. DPTR is selected when DPS[0] = 0 and DPTR1 is selected
when DPS[0] = 1.
The user switches between pointers by toggling the LSB of the DPS register. The values in the data pointers
are not affected by the LSB of the DPS register. All DPTR related instructions use the currently selected
DPTR for any activity.
Data Sheet 71M6531D/F-71M6532D/F
The 80515 writes into external data memory when the MPU executes a MOVX @Ri,A or MOVX
@DPTR,A instruction. The MPU reads external data memory by executing a MOVX A,@Ri or MOVX
A,@DPTR instruction (SFR PDATA provides the upper 8 bytes for the MOVX A,@Ri instruction).
Internal and External Memory Map
Table 7
†
20
00000-1FFFF/
00000-3FFFF
Memory size depends on the IC. See
2000-20BF,
20C0-20C7
20C8-20FF
0000-0FFF
0000-00FF
Address
(hex)
Only the memory ranges shown in
shows the address, type, use and size of the various memory components.
The second data pointer may not be supported by certain compilers.
DPTR1 is useful for copy routines, where it can make the inner loop of the routine two instructions faster
compared to the reloading of DPTR from registers. Any interrupt routine using DPTR1 must save
and restore DPS, DPTR and DPTR1, which increases stack usage and slows down interrupt latency.
By selecting the Evatronics R80515 core in the Keil compiler project settings and by using the
compiler directive “MODC2”, dual data pointers are enabled in certain library routines.
Technology
Static RAM
Static RAM
Static RAM
Static RAM
Memory
Memory
Flash
© 2005-2010 TERIDIAN Semiconductor Corporation
Non-volatile
Non-volatile
Memory
(battery)
Volatile
Volatile
Volatile
Type
Section1.5.5 Physical Memory
Table 7
Table 7: Memory Map
Configuration RAM,
Configuration RAM,
Program memory
for MPU and CE
contain physical memory.
External RAM
Internal RAM
I/O RAM
I/O RAM
(XRAM)
Name
Part of 80515 Core
MPU Program and
Shared by CE and
CE program (on 1
Hardware control
non-volatile data
Battery-buffered
Typical Usage
for details.
KB boundary)
memory
MPU
FDS 6531/6532 005
Memory Size
8 KB max.
256 KB
128 KB/
(bytes)
4 KB
256
256
8
†
v1.3