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参数资料
| 型号： | R8A66171SP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDSO24 |
| 封装： | SOP-24 |
| 文件页数： | 24/24页 |
| 文件大小： | 678K |
| 代理商： | R8A66171SP |
9
XMEGA E5 [DATASHEET]
8153G–AVR–10/2013
after reset, and the initial value is the highest address of the internal SRAM. If the SP is changed, it must be set to point
above address 0x2000, and it must be defined before any subroutine calls are executed or before interrupts are enabled.
During interrupts or subroutine calls, the return address is automatically pushed on the stack. The return address can be
two or three bytes, depending on program memory size of the device. For devices with 128KB or less of program
memory, the return address is two bytes, and hence the stack pointer is decremented/incremented by two. For devices
with more than 128KB of program memory, the return address is three bytes, and hence the SP is
decremented/incremented by three. The return address is popped off the stack when returning from interrupts using the
RETI instruction, and from subroutine calls using the RET instruction.
The SP is decremented by one when data are pushed on the stack with the PUSH instruction, and incremented by one
when data is popped off the stack using the POP instruction.
To prevent corruption when updating the stack pointer from software, a write to SPL will automatically disable interrupts
for up to four instructions or until the next I/O memory write.
7.8
Register File
The register file consists of 32 x 8-bit general purpose working registers with single clock cycle access time. The register
file supports the following input/output schemes:
One 8-bit output operand and one 8-bit result input
Two 8-bit output operands and one 8-bit result input
Two 8-bit output operands and one 16-bit result input
One 16-bit output operand and one 16-bit result input
Six of the 32 registers can be used as three 16-bit address register pointers for data space addressing, enabling efficient
address calculations. One of these address pointers can also be used as an address pointer for lookup tables in flash
program memory.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| R8A66173SP | 制造商:Renesas Electronics Corporation 功能描述: |
| R8A66174SP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:PARALLEL-IN SERIAL-OUT DATA BUFFER WITH FIFO |
| R8A66593FP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:ASSP (USB2.0 Peripheral Controller) |
| R8A66597BG | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:ASSP (USB2.0 2 Port Host/1 Port Peripheral Controller) |
| R8A66597BG#DF1S | 制造商:Renesas Electronics Corporation 功能描述:USB 2, 2-PORT HOST OR 1-PORT PERIPH CTRL - Tape and Reel 制造商:Renesas Electronics Corporation 功能描述:IC CONTROLLER USM 81LFBGA |
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