Datasheet

15 12 11 10 7 6 5 4 3 0

0 0 0

1 1

Source bits 19:16 A/L

0 0

Destination bits 19:16

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MSP430 and MSP430X Instructions

4.5.2.2 Non-Register Mode Extension Word

The extension word for non-register modes is shown in Figure 4-25 and described in Table 4-12. An

example is shown in Figure 4-27.

Figure 4-25. Extension Word for Non-Register Modes

Table 4-12. Description of Extension Word Bits for Non-Register Modes

Bit Description

15:11 Extension word op-code. Op-codes 1800h to 1FFFh are extension words.

Source Bits The four MSBs of the 20-bit source. Depending on the source addressing mode, these four MSBs may belong to an

19:16 immediate operand, an index or to an absolute address.

A/L Data length extension. Together with the B/W bits of the following MSP430 instruction, the AL bit defines the used

data length of the instruction.

A/L B/W Comment

0 0 Reserved

0 1 20-bit address word

1 0 16-bit word

1 1 8-bit byte

5:4 Reserved

Destination The four MSBs of the 20-bit destination. Depending on the destination addressing mode, these four MSBs may

Bits 19:16 belong to an index or to an absolute address.

NOTE: B/W and A/L bit settings for SWPBX and SXTX

A/L B/W

0 0 SWPBX.A, SXTX.A

0 1 N/A

1 0 SWPB.W, SXTX.W

1 1 N/A

149

SLAU144J–December 2004–Revised July 2013 CPUX

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