參數(shù)資料
型號(hào): ARM7TDMI-S
英文描述: ARM7TDMI-S Microprocessor Core preliminary technical manual 5/00
中文描述: 的ARM7TDMI - S微處理器核的初步技術(shù)手冊(cè)5 / 00
文件頁(yè)數(shù): 160/184頁(yè)
文件大?。?/td> 1147K
代理商: ARM7TDMI-S
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B-14
Detailed Debug Operation
Rev. A
Copyright 2000 by LSI Logic Corporation. All rights reserved.
During normal operation, CLKEN conditionally enables CLK to clock the
core. When the ARM7TDMI-S core is in debug state, DBGTCKEN
conditionally enables CLK to clock the core.
B.7 Determining the Core and System State
When the ARM7TDMI-S core is in debug state, force the load and store
multiples into the instruction pipeline to examine the core and system
state.
Before you can examine the core and system state, the debugger must
determine whether the processor entered debug from Thumb state or
ARM state. It examines bit 4 of the EmbeddedICE Debug Status
Register. When bit 4 is HIGH, the core has entered debug from Thumb
state; when bit 4 is LOW the core has entered debug entered from ARM
state.
B.7.1 Determining the Core State
When the processor has entered debug state from Thumb state, the
simplest course of action is for the debugger to force the core back into
ARM state. The debugger can then execute the same sequence of
instructions to determine the processor state.
To force the processor into ARM state, execute the following sequence
of Thumb instructions on the core:
STR R0, [R0] ; Save R0 before use
MOV R0, PC ; Copy PC into R0
STR R0, [R0] ; Now save the PC in R0
BX PC ; Jump into ARM state
MOV R8, R8 ; NOP
MOV R8, R8 ; NOP
Note:
Because all Thumb instructions are only 16 bits long, the
simplest course of action, when shifting Scan Chain 1 is to
repeat the instruction. For example, the encoding for BX R0
is 0x4700, so when 0x47004700 shifts into Scan Chain 1,
the debugger does not have to keep track of the half of the
bus on which the processor expects to read the data.
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