73s1217f68im Maxim Integrated Products, Inc., 73s1217f68im Datasheet - Page 14
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73s1217f68im
Manufacturer Part Number
73s1217f68im
Description
Bus-powered 80515 System-on-chip With Usb, Iso 7816 / Emv, Pinpad And More
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.73S1217F68IM.pdf
(140 pages)
- Current page: 14 of 140
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External Data Memory: While the 80515 can address up to 64KB of external data memory in the space
from 0x0000 to 0xFFFF, only the memory ranges shown in Figure 2 contain physical memory. 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.
There are two types of instructions, differing in whether they provide an eight-bit or sixteen-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. This method allows the user access to the first 256 bytes of the 2KB of
external data RAM. In the second type of MOVX instruction (MOVX A,@DPTR), the data pointer
generates a sixteen-bit address.
14
Addres
s
0xFF
0x80
0x7F
0x30
0x2F
0x20
0x1F
0x00
Direct Addressing
Registers (SFRs)
Special Function
Table 4: Internal Data Memory Map
Byte or bit-addressable area
Register banks R0…R7 (x4)
Byte-addressable area
Indirect Addressing
RAM
Rev. 1.2
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