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PC912XDP512F0CFVR Fiches technique(PDF) 214 Page - Freescale Semiconductor, Inc

No de pièce PC912XDP512F0CFVR
Description  HCS12X Microcontrollers
PDF  1348 Pages
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

PC912XDP512F0CFVR Fiches technique(HTML) 214 Page - Freescale Semiconductor, Inc

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Chapter 6 XGATE (S12XGATEV2)
MC9S12XDP512 Data Sheet, Rev. 2.21
214
Freescale Semiconductor
6.8.2.5
Bit Field Operations
This addressing mode is used to identify the position and size of a bit field for insertion or extraction. The
width and offset are coded in the lower byte of the source register 2, RS2. The content of the upper byte is
ignored. An offset of 0 denotes the right most position and a width of 0 denotes 1 bit. These instructions
are very useful to extract, insert, clear, set or toggle portions of a 16 bit word.
Figure 6-23. Bit Field Addressing
BFEXT
R3,R4,R5 ; R5: W4 bits offset O4, will be extracted from R4 into R3
6.8.2.6
Special Instructions for DMA Usage
The XGATE offers a number of additional instructions for flag manipulation, program flow control and
debugging:
1. SIF: Set a channel interrupt flag
2. SSEM: Test and set a hardware semaphore
3. CSEM: Clear a hardware semaphore
4. BRK: Software breakpoint
5. NOP: No Operation
6. RTS: Terminate the current thread
W4
O4
15
0
2
5
W4=3, O4=2
15
0
3
Bit Field Extract
Bit Field Insert
RS2
RS1
RD



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