DS89C420-QCL Datasheet, PDF (138/139 Pages) Maxim Integrated Products – Ultra-High-Speed Flash Microcontroller User’s Guide

Ultra-High-Speed Flash
Microcontroller User’s Guide
E:BADVAL
The requested value cannot be programmed into the OCR register because it contains 1’s in bit position(s) where 0’s have already
been programmed.
E:EXTARG
Extra data was encountered on the command line when it was not needed. Reenter the command.
E:ILLOPT
The optional parameters given were in error. If the start address is greater than the end address, either implicitly or explicitly, then an
error is printed. The range bit implicitly determines the maximum range.
E:LOCK BITS ENABLED
The requested operation cannot be performed due to the current lock bit settings.
E:LOCK BITS ALREADY SET
The requested lock bit setting cannot be programmed because a higher order lock bit has already been programmed.
E:NOTHEX
A nonhexadecimal character was found when expecting a hexadecimal character.
E:VALUE MUST BE 1, 3 OR 7
A value other than 1, 3, or 7 was entered when trying to write the lock bits.
PARALLEL PROGRAMMING MODE
The parallel program load mode is compatible with most industry-standard parallel programmers (Figure 15-3). The data sheet con-
tains the most comprehensive information relating to the parallel programming mode.
ADDRESS 7:0
DRIVE HIGH
ERROR
BUSY/READY
CONTROL
CONTROL
4MHz TO 6MHz
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
RST
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
P3.6
P3.7
XTAL2
XTAL1
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
µC
EA
ALE PROG
PSEN
P2.7
P2.6
P2.5
P2.4
P2.3
P2.2
P2.1
P2.0
DATA
DRIVE HIGH
CONTROL
DRIVE LOW
CONTROL
CONTROL
Figure 15-3. Parallel Load Hardware Configuration
____________________________________________________________________________________________ 138