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參數(shù)資料
| 型號(hào)： | MPC509 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Highly Integrated, Low-Power, 32-Bit Microcontroller |
| 中文描述： | 32-BIT, RISC MICROCONTROLLER, PQFP16 |
| 文件頁(yè)數(shù)： | 219/300頁(yè) |
| 文件大?。?/td> | 3744K |
| 代理商： | MPC509 |
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MPC509
USER’S MANUAL
DEVELOPMENT SUPPORT
Rev. 15 June 98
MOTOROLA
8-1
SECTION 8
DEVELOPMENT SUPPORT
Development tools are used by a microcomputer system developer to debug the hard-
ware and software of a target system. These tools are used to give the developer
some control over the execution of the target program. In-circuit emulators and bus
state analyzers are the most frequently used debugging tools. In order for these tools
to function properly, they must have full visibility of the microprocessor’s buses.
Visibility extends beyond the address and data portions of the buses and includes
attribute and handshake signals. In some cases it may also include bus arbitration sig-
nals and signals which cause processor exceptions such as interrupts and resets. The
visibility requirements of emulators and bus analyzers are in opposition to the trend of
modern microcomputers and microprocessors where the CPU bus may be hidden
behind a memory management unit or cache or where bus cycles to internal resources
are not visible externally.
The development tool visibility requirements may be reduced if some of the develop-
ment support functions are included in the silicon. For example, if the bus comparator
part of a bus analyzer or breakpoint generator is included on the chip, it is not neces-
sary for the entire bus to be visible at all times. In many cases the visibility
requirements may be reduced to instruction fetch cycles for tracking program execu-
tion. If some additional status information is also available to assist in execution
tracking and the development tool has access to the source code, then the only need
for bus visibility is often the destination address of indirect change-of-flow instructions
(return from subroutine, return from interrupt, and indexed branches and jumps).
Since full bus visibility reduces available bus bandwidth and processor performance,
certain development support functions have been included in the MCU. These func-
tions include the following:
Controls to limit which internal bus cycles are reflected on the external bus (show
cycles)
CPU status signals to allow instruction execution tracking with minimal visibility of
the instructions being fetched
Watchpoint comparators that can generate breakpoints or signal an external bus
analyzer
A serial development port for general emulation control
8.1 Program Flow Tracking
The exact program flow is visible on the external bus only when the processor is pro-
grammed to show all fetch cycles on the external bus. This mode is selected by
programming the ISCTL (instruction fetch show cycle control) field in the I-bus support
control register (ICTRL), as shown in
Table 8-2
. In this mode, the processor is fetch
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| MPC509A | 制造商:BB 制造商全稱:BB 功能描述:Single-Ended 8-Channel/Differential 4-Channel CMOS ANALOG MULTIPLEXERS |
| MPC509AP | 功能描述:多路器開關(guān) IC 4-Ch Diff-Input Analog Mult RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MPC509AP | 制造商:BURR-BROWN 功能描述:IC MUX 4CH DP DIP28 509 制造商:Texas Instruments 功能描述:Multiplexer IC Multiplexer Type:Differen |
| MPC509APG4 | 功能描述:多路器開關(guān) IC 4Ch Diff-Input Ana Multiplexer RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MPC509AU | 功能描述:多路器開關(guān) IC 4-Ch Diff-Input Analog Mult RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 傳播延遲時(shí)間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
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