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參數(shù)資料
| 型號(hào)： | 68HC16MODULE |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 68HC16 Module |
| 中文描述： | 68HC16接口模塊 |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大?。?/td> | 183K |
| 代理商： | 68HC16MODULE |
6
68HC16 Module
_______________________________________________________________________________________
3
Boot ROM
The boot ROM, U3, is configured as an 8-bit memory
device. Resistor R4 pulls data bit 0 low during system
reset, forcing the μC to fetch instructions using only the
upper eight data bits. The boot ROM checks the system
and waits for commands from the host. Refer to the EV
kit manual for specific start-up procedures.
Software
All software is supplied on a disk with the EV kit.
Instructions for operating the software are included in
the EV kit manual. Refer to the EV kit manual for more
information.
68HC16 Module Self Check
To test the 68HC16 module’s integrity, connect the
power supply to the power terminals (J2). Do not con-
nect anything to J1 or J3. Slide the power switch SW1
to the “ON” position. The LED will light up, and will flash
within 5 seconds.
If the LED flashes with a 50%-on/50%-off duty cycle, then
it passed its self check. Note that this test does not exer-
cise the RS-232 port or the EV kit 40-pin interface, but it
does confirm that the power supply, microprocessor,
ROM, and RAM passed the self test.
If the LED flashes with a 10%-on/90%-off duty cycle,
then it failed its self check. Most likely, the RAM chip
(U5) is bad.
If the LED remains on and does not flash, then the prob-
lem is either U3 (the EPROM), U1 (the microprocessor),
U4 (the regulator), the MAX707 reset generator, or the
power supply. Use a voltmeter to verify that the power
supplies are good. Check the power-supply input and the
+5V output from the regulator. Use an oscilloscope to see
if the 32.768kHz reference oscillator is running.
Table 3. 68HC16 Module Memory Map
(all address values are in 20-bit hex)
Boot ROM (U3, strobed by CSBOOT)
Shadow of boot ROM
User RAM (U5, strobed by CS0 and CS2)
00000–07FFF
08000–0FFFF
10000–17FFF
FUNCTION
PIN
Shadow of user RAM
Internal standby RAM; 1kbyte
18000–1FFFF
20000–203FF
Unused
External chip select (J1 pin 11) (CS7)
External chip select (J1 pin 12) (CS8)
External chip select (J1 pin 13) (CS9)
External chip select (J1 pin 14) (CS10)
20400–7DFFF
7E000–7E7FF
7E800–7EFFF
7F000–7F7FF
7F800–7FFFF
Not accessed by the 68HC16
Unused
68HC16’s built-in ADC (not used)
Unused
General-purpose timer module (GPT)
Unused
System integration module (SIM)
Unused
Internal standby RAM (SRAM)
control registers
Unused
Queued serial module (QSM)
Unused
80000–F7FFF
F8000–FF6FF
FF700–FF73F
FF740–FF8FF
FF900–FF93F
FF940–FF9FF
FFA00–FFA7F
FFA80–FFAFF
FFB00–FFB07
FFB08–FFBFF
FFC00–FFDFF
FFE00–FFFFF
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