DSPIC33EP64GS708 datasheet(31/484 Pages) MICROCHIP

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DS70005258C-page 31

dsPIC33EPXXXGS70X/80X FAMILY

bit 2

SFA: Stack Frame Active Status bit

1 = Stack frame is active; W14 and W15 address 0x0000 to 0xFFFF, regardless of DSRPAG

0 = Stack frame is not active; W14 and W15 address the base Data Space

bit 1

RND: Rounding Mode Select bit

1 = Biased (conventional) rounding is enabled

0 = Unbiased (convergent) rounding is enabled

bit 0

IF: Integer or Fractional Multiplier Mode Select bit

1 = Integer mode is enabled for DSP multiply

0 = Fractional mode is enabled for DSP multiply

CORCON: CORE CONTROL REGISTER (CONTINUED)

Note 1:

This bit is always read as ‘0’.

The IPL3 bit is concatenated with the IPL<2:0> bits (SR<7:5>) to form the CPU Interrupt Priority Level.

CTXTSTAT: CPU W REGISTER CONTEXT STATUS REGISTER

U-0

R-0

—

CCTXI2

CCTXI1

CCTXI0

bit 15

bit 8

U-0

R-0

—

MCTXI2

MCTXI1

MCTXI0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-11

Unimplemented: Read as ‘0’

bit 10-8

CCTXI<2:0>: Current (W Register) Context Identifier bits

111 = Reserved

•

101 = Reserved

100 = Alternate Working Register Set 4 is currently in use

011 = Alternate Working Register Set 3 is currently in use

010 = Alternate Working Register Set 2 is currently in use

001 = Alternate Working Register Set 1 is currently in use

000 = Default register set is currently in use

bit 7-3

Unimplemented: Read as ‘0’

bit 2-0

MCTXI<2:0>: Manual (W Register) Context Identifier bits

111 = Reserved

•

101 = Reserved

100 = Alternate Working Register Set 4 was most recently manually selected

011 = Alternate Working Register Set 3 was most recently manually selected

010 = Alternate Working Register Set 2 was most recently manually selected

001 = Alternate Working Register Set 1 was most recently manually selected

000 = Default register set was most recently manually selected

DSPIC33EP64GS708 数据表(PDF) 31 Page - Microchip Technology

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