- 您现在的位置：买卖IC网 > PDF目录368612 > S5N8947 (SAMSUNG SEMICONDUCTOR CO. LTD.) MCU for ADSL/Cable Modem PDF资料下载
参数资料
| 型号： | S5N8947 |
| 厂商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | MCU for ADSL/Cable Modem |
| 中文描述： | 单片机为ADSL / Cable Modem的 |
| 文件页数： | 18/49页 |
| 文件大小： | 407K |
| 代理商： | S5N8947 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页
S5N8947 (ADSL/Cable Modem MCU)
ELECTRONICS
MagIC Team
Page : 18
SAMSUNG ELECTRONICS
5.4. OPERATING MODES
The ARM7TDMI core supports seven operating modes:
l
User mode: the normal program execution state
l
FIQ (Fast Interrupt Request) mode: for supporting a specific data transfer or channel process
l
IRQ (Interrupt ReQuest) mode: for general purpose interrupt handling
l
Supervisor mode: a protected mode for the operating system
l
Abort mode: entered when a data or instruction pre-fetch is aborted
l
System mode: a privileged user mode for the operating system
l
Undefined mode: entered when an undefined instruction is executed
Operating mode changes can be controlled by software, or they can be caused by external interrupts
or exception processing. Most application programs execute in User mode. Privileged modes (that is, all
modes other than User mode) are entered to service interrupts or exceptions, or to access protected
resources.
5.5. REGISTERS
The S5N8947 CPU core has a total of 37 registers: 31 general-purpose 32-bit registers, and 6 status
registers. Not all of these registers are always available. Which registers are available to the programmer at
any given time depends on the current processor operating state and mode.
NOTE :
When the S5N8947 is operating in ARM state, 16 general registers and one or two status
registers can be accessed at any time. In privileged mode, mode-specific banked registers are
switched in.
Two register sets, or banks, can also be accessed, depending on the core's current state: the ARM
state register set and the
THUMB state register
set:
l
The ARM state register set contains 16 directly accessible registers: R0-R15. All of these registers,
except for R15, are for general-purpose use, and can hold either data or address values. An additional
(seventeenth) register, the CPSR (Current Program Status Register), is used to store status
information.
l
The THUMB state register set is a subset of the ARM state set. You can access eight general
registers, R0-R7, as well as the program counter (PC), a stack pointer register (SP), a link register
(LR), and the CPSR. Each privileged mode has a corresponding banked stack pointer, link register,
and saved process status register (SPSR).
The THUMB state registers are related to the ARM state registers as follows:
l
THUMB state R0-R7 registers and ARM state R0-R7 registers are identical
l
THUMB state CPSR and SPSRs and ARM state CPSR and SPSRs are identical
l
THUMB state SP, LR, and PC map directly to ARM state registers R13, R14, and R15, respectively
In THUMB state, registers R8-R15 are not part of the standard register set. However, you can access
them for assembly language programming and use them for fast temporary storage, if necessary.
5.6. EXCEPTIONS
相关PDF资料 |
PDF描述 |
|---|---|
| S5N8947X | MCU for ADSL/Cable Modem |
| S5N8950 | G.dmt ADSL Transceiver for CO and CPE |
| S5N8951 | G.dmt ADSL Analog Front End IC |
| S5N8951X | G.dmt ADSL Analog Front End IC |
| S5N8952 | ADSL Transceiver for NIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| S5N8947X | 制造商:SAMSUNG 制造商全称:Samsung semiconductor 功能描述:MCU for ADSL/Cable Modem |
| S5N8950 | 制造商:SAMSUNG 制造商全称:Samsung semiconductor 功能描述:G.dmt ADSL Transceiver for CO and CPE |
| S5N8951 | 制造商:SAMSUNG 制造商全称:Samsung semiconductor 功能描述:G.dmt ADSL Analog Front End IC |
| S5N8951X | 制造商:SAMSUNG 制造商全称:Samsung semiconductor 功能描述:G.dmt ADSL Analog Front End IC |
| S5N8952 | 制造商:SAMSUNG 制造商全称:Samsung semiconductor 功能描述:ADSL Transceiver for NIC |
发布紧急采购，3分钟左右您将得到回复。