604-00050 Parallax Inc, 604-00050 Datasheet - Page 20

• Manufacturer Part Number: 604-00050
• Description: IC FLOATING-PT COPROC V3 18-DIP
• Manufacturer: Parallax Inc

Specifications of 604-00050

• Processor Type: Floating-Point Co-Processor
• Voltage: 2.7V ~ 5.5V
• Mounting Type: Through Hole
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Speed: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

EEPROM Memory
There are 1024 bytes of EEPROM memory reserved on the uM-FPU for storing user-defined functions and data.
The EESAVE, EESAVEA, EELOAD, EELOADA instructions are used to store and retrieve data. The EEWRITE
instruction is used to store user-defined functions at run-time. The ECALL instruction is used to call the user-defined
functions stored in EEPROM memory. The Busy condition remains set while all of the instructions in the called
function execute. When storing a user-defined function in EEPROM, the first byte of an EEPROM slot must contain
the length of the user-defined function, and the last byte must be a RET instruction. This is used as a validity check
for user-defined functions before the code stored in EEPROM is executed. User-defined functions in EEPROM are
restricted to a total length of 256 bytes. Care should be taken to keep track of how much space is used by a user-
defined functions so that it doesn’t overlap any slots used for data storage.
Micromega Corporation
03FF
0100
EEPROM slot
EEPROM slot
EEPROM slot
252
0
4
EEPROM slot
EEPROM slot
EEPROM Memory Layout
253
1
20
.
.
.
EEPROM slot
EEPROM slot
254
2
uM-FPU V3.1 Datasheet
EEPROM slot
EEPROM slot
EEPROM slot
Flash Memory
251
255
3