Maxim Integrated 71M6534 Energy Meter IC Family Software - Manual (Page 17)

71M653X Software User’s Guide
3
3 DESIGN REFERENCE
As depicted in Figure 1 of section 2, the 71M653X provides a great deal of design flexibility for the application de-
veloper. Programming details are described below.
3.1 PROGRAM MEMORY
The embedded 80515 MPU within the 71M653X has separate program (128K or 256K bytes) and data memory (4K
bytes). The code for the Compute Engine program resides in the MPU program memory (flash).
The Flash program memory is addressed as a 64KB block. The upper 32K is a window on a code banked. It can be
switched to other code banks by writing a banke numbe rto the banked register FL_BANK. The flash memory is further
segmented in 512-byte pages which can be individually erased. Selection of these individual blocks is accomplished
using the function calls related to flash memory, which are described in more detail below.
3.2 DATA MEMORY
The 71M653X has 4K bytes of Data Memory used by the embedded 80C515 MPU, and shared with the proprietary
computer-engine (CE). In most configurations, the CE uses 1K of this RAM, leaving 3K for use by the MPU. See Table
3-1: for a summary.
Address
(hex)
Memory
Technology
Memory Type Typical Usage
Wait States
(at 5MHz)
Memory Size
(bytes)
0000-7FFF Flash Memory Non-volatile
Common code area for the
program and non-volatile
data.
0 32K
8000-FFFF Flash Memory Non-volatile
Bank window code area for
the program and non-
volatile data. The 6531, 32,
and 33 have 3 banks
yielding 128K total. The
6534 has 7 banks, yielding
256K total
0 32K
0000-03FF Static RAM Volatile
CE data, actual last byte
may be somewhat less than
1K, depending on the CE
code.
0 1KB
0400-1000 Static RAM Volatile MPU data 0 3KB
2000-20FF Static RAM
Miscellaneous I/O RAM
(configuration RAM)
Volatile 0 256
Table 3-1: Memory Map
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