DS89C420-QCL Datasheet, PDF (134/139 Pages) Maxim Integrated Products – Ultra-High-Speed Flash Microcontroller User’s Guide

Ultra-High-Speed Flash
Microcontroller User’s Guide
Table 15-2. ROM Loader Baud Rates vs. Crystal Frequency
CRYSTAL FREQUENCY (MHz)
32.0000
29.4912
24.5760
24.0000
22.1184
20.0000
16.0000
11.0592
1.84320
TIMER
RELOAD
F6
F3
EC
FC
F8
F4
F6
F5
F4
F3
F0
E6
FF
FE
FD
F8
F0
E8
FB
F6
F4
FF
FE
FD
FF
FE
FD
LOADER
BAUD RATE
16667
12821
8333
38400
19200
12800
12800
11636
10667
9615
7812
4808
115200
57600
38400
13021
6510
4340
16667
8333
6944
57600
28800
19200
9600
4800
3200
ERROR (%)
-1.3
-0.2
-1.3
0.0
0.0
0.0
0.0
-1.0
-1.8
-0.2
-1.7
-0.2
0.0
0.0
0.0
-1.7
-1.7
-1.7
-1.3
-1.3
-2.4
0.0
0.0
0.0
0.0
0.0
0.0
PC UART
BAUD RATE
16457
12800
8229
38400
19200
12800
12800
11520
10473
9600
7680
4800
115200
57600
38400
12800
6400
4267
16457
8229
6776
57600
28800
19200
9600
4800
3200
PC UART
RELOAD
7
9
14
3
6
9
9
10
11
12
15
24
1
2
3
9
18
27
7
14
17
2
4
6
12
24
36
Note: Only a few possible timer reload/PC UART reload values are shown per crystal frequency. This table, by no means, is an exhaustive list of acceptable configurations
for each crystal frequency, nor should it be considered a list of the allowable crystal frequencies.
Table 15-3. Alphabetic Commands
COMMAND
B
C
CX
D
DX
K
L
LB
LE
FUNCTION
Self-CFC of internal ROM code.
CRC-16 of flash memory range (inhibited if either LB2 or LB3 set).
CRC-16 of external RAM range.
Dump Intel hex from internal flash memory range.
Dump Intel hex from external RAM range.
Klear-Erase entire flash memory range.
Load flash memory (Oh–3FFFh).
Load flash memory blindly (Oh–3FFFh)—no verify or precheck.
Load encryption vector (0–3Fh).
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