您的位置：维库电子市场网 > Datasheet > DSPIC30F6011AT-20E/PF

DSPIC30F6011AT-20E/PF Datasheet

  • DSPIC30F6011AT-20E/PF

  • High Performance Digital Signal Controllers

  • 3527.50KB

  • 222页

  • MICROCHIP   MICROCHIP

阅览下载 纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

dsPIC30F6011/6012/6013/6014
FIGURE 3-5:
PROGRAM DATA TABLE ACCESS (MS BYTE)
TBLRDH.W
PC Address
0x000000
0x000002
0x000004
0x000006
00000000
00000000
00000000
00000000
TBLRDH.B (Wn<0> = 0)
Program Memory
鈥楶hantom鈥?Byte
(read as 鈥?鈥?
23
16
8
0
TBLRDH.B (Wn<0> = 1)
3.1.2
DATA ACCESS FROM PROGRAM
MEMORY USING PROGRAM SPACE
VISIBILITY
The upper 32 Kbytes of data space may optionally be
mapped into any 16K word program space page. This
provides transparent access of stored constant data
from X data space without the need to use special
instructions (i.e.,
TBLRDL/H, TBLWTL/H
instructions).
Program space access through the data space occurs
if the MS bit of the data space EA is set and program
space visibility is enabled by setting the PSV bit in the
Core Control register (CORCON). The functions of
CORCON are discussed in Section 2.4, DSP Engine.
Data accesses to this area add an additional cycle to
the instruction being executed, since two program
memory fetches are required.
Note that the upper half of addressable data space is
always part of the X data space. Therefore, when a
DSP operation uses program space mapping to access
this memory region, Y data space should typically con-
tain state (variable) data for DSP operations, whereas
X data space should typically contain coefficient
(constant) data.
Although each data space address, 0x8000 and higher,
maps directly into a corresponding program memory
address (see Figure 3-6), only the lower 16 bits of the
24-bit program word are used to contain the data. The
upper 8 bits should be programmed to force an illegal
instruction to maintain machine robustness. Refer to
the
dsPIC30F Programmer鈥檚 Reference Manual
(DS70030) for details on instruction encoding.
Note that by incrementing the PC by 2 for each
program memory word, the LS 15 bits of data space
addresses directly map to the LS 15 bits in the corre-
sponding program space addresses. The remaining
bits are provided by the Program Space Visibility Page
register, PSVPAG<7:0>, as shown in Figure 3-6.
Note:
PSV access is temporarily disabled during
table reads/writes.
For instructions that use PSV which are executed
outside a REPEAT loop:
鈥?The following instructions will require one
instruction cycle in addition to the specified
execution time:
-
MAC
class of instructions with data operand
pre-fetch
-
MOV
instructions
-
MOV.D
instructions
鈥?All other instructions will require two instruction
cycles in addition to the specified execution time
of the instruction.
For instructions that use PSV which are executed
inside a REPEAT loop:
鈥?The following instances will require two instruction
cycles in addition to the specified execution time
of the instruction:
- Execution in the first iteration
- Execution in the last iteration
- Execution prior to exiting the loop due to an
interrupt
- Execution upon re-entering the loop after an
interrupt is serviced
鈥?Any other iteration of the REPEAT loop will allow
the instruction accessing data, using PSV, to
execute in a single cycle.
铮?/div>
2004 Microchip Technology Inc.
Preliminary
DS70117C-page 27

DSPIC30F6011AT-20E/PF相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

©2024 维库电子市场网（www.dzsc.com）　备案号：浙B2-20050339-1 经营许可证：浙B2-20210386版权声明
买家服务热线：0571-85317607 | 买家服务部QQ： QQ:1609526468
卖家服务热线：0571-85317607 | 卖家服务部QQ： QQ:331652727

扫码下载APP，
一键连接广大的电子世界。

在线人工客服

买家服务：
卖家服务：

0571-85317607

客服在线时间周一至周五
9:00-17:30

关注官方微信号，
第一时间获取资讯。

建议反馈
返回顶部

建议反馈

联系人：

联系方式：

按住滑块，拖拽到最右边
>>
感谢您向阿库提出的宝贵意见，您的参与是维库提升服务的动力！意见一经采纳，将有感恩红包奉上哦！

PDF纠错X

投诉电话：0571-85317607 投诉QQ：

如选匿名将无法为您反馈投诉结果，建议实名投诉！