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參數(shù)資料
| 型號： | MAXQ3212-EMX+ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, EEPROM, 3.58 MHz, RISC MICROCONTROLLER, PDIP24 |
| 封裝： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, MS-001AF, DIP-24 |
| 文件頁數(shù)： | 14/25頁 |
| 文件大?。?/td> | 319K |
| 代理商： | MAXQ3212-EMX+ |
In-Circuit Debug
Embedded debugging capability is available through
the JTAG-compatible Test Access Port. Embedded
debug hardware and embedded ROM firmware pro-
vide in-circuit debugging capability to the user applica-
tion, eliminating the need for an expensive in-circuit
emulator. Figure 5 shows a block diagram of the in-cir-
cuit debugger. The in-circuit debug features include:
Hardware debug engine
Set of registers able to set breakpoints on register,
code, or data accesses
Set of debug service routines stored in the utility
ROM
The embedded hardware debug engine is an indepen-
dent hardware block in the microcontroller. The debug
engine can monitor internal activities and interact with
selected internal registers while the CPU is executing
user code. Collectively, the hardware and software fea-
tures allow two basic modes of in-circuit debugging:
Background mode allows the host to configure and
set up the in-circuit debugger while the CPU contin-
ues to execute the application software at full
speed. Debug mode can be invoked from back-
Debug mode allows the debug engine to take con-
trol of the CPU, providing read/write access to inter-
nal registers and memory, and single-step trace
operation.
Applications Information
Grounds and Bypassing
Careful PC board layout significantly minimizes crosstalk
among the reference input, comparator outputs, and dig-
ital inputs. Keep digital and analog lines separate, and
use ground traces as shields between them where pos-
sible. Separate CMPI and VREF from each other by run-
ning a ground trace between these pins. Bypass VDD
with a capacitor as low as 1F and keep bypass capaci-
tor leads short for best noise rejection.
Applications
The low-power, high-performance RISC architecture of
the MAXQ3212 makes it an excellent fit for many
portable or battery-powered applications that require
cost-effective computing. The analog comparator can
function as an analog-to-digital converter (ADC) when
simple analog measurements are necessary, and the
high-current I/O pin can drive a power or status LED.
This device can also be used as a low-cost ADC. The
single-slope conversion method can be easily imple-
mented using the internal comparator and an internal
timer. The basic implementation of such a converter is
illustrated below. One of the benefits of this approach is
the small number of external components required: the
transistor creates a constant current source, a ramp
capacitor times the conversion, and a resistor and
capacitor on the comparator input acting as a simple
filter. The result is the addition of A/D capability to the
end system at virtually no additional cost.
MAXQ3212
Microcontroller with Analog Comparator
and LED Driver
____________________________________________________________________
21
TAP
CONTROLLER
CPU
DEBUG
ENGINE
DEBUG
SERVICE
ROUTINES
(UTILITY ROM)
TMS
TCK
TDI
TDO
CONTROL
BREAKPOINT
ADDRESS
DATA
MAXQ3212
Figure 5. In-Circuit Debugger
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相關代理商/技術參數(shù) |
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