M166 datasheet(71/127 Pages) SIEMENS

Part #	M166

Description	C16x Family of Siemens 16-Bit CMOS Single-Chip Microcontrollers

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Manufacturer	SIEMENS [Siemens Semiconductor Group]

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71 / 127 page

30Mar98@15:00h

Semiconductor Group

71

Version 1.2, 12.97

C166 Family Instruction Set

Instruction Description

EXTS

Begin EXTended Segment Sequence

EXTS

Syntax

EXTS

op1, op2

Operation

(count)

← (op2) [1 ≤ op2 ≤ 4]

Disable interrupts and Class A traps

Data_Segment = (op1)

DO WHILE ((count)

≠ 0 AND Class_B_trap_condition ≠ TRUE)

Next Instruction

(count)

← (count) - 1

END WHILE

(count) = 0

Data_Page = (DPPx)

Enable interrupts and traps

Description

Overrides the standard DPP addressing scheme of the long and indirect

addressing modes for a specified number of instructions. During their exe-

cution, both standard and PEC interrupts and class A hardware traps are

locked. The EXTS instruction becomes immediately active such that no

additional NOPs are required.

For any long (’mem’) or indirect ([...]) address in an EXTS instruction

sequence, the value of op1 determines the 8-bit segment (address bits

A23-A16) valid for the corresponding data access. The long or indirect

address itself represents the 16-bit segment offset (address bits A15-A0).

The value of op2 defines the length of the effected instruction sequence.

Note

The EXTS instruction must be used carefully (see introductory note).

The EXTS instruction is not available in the SAB 8XC166(W) devices.

E Not affected.

Z Not affected.

V Not affected.

C Not affected.

N Not affected.

Addressing Modes

Mnemonic

Format

Bytes

EXTS

Rwm, #irang2

DC :00##-m

2

EXTS

#seg, #irang2

D7 :00##-0 ss 00

4

Condition Flags

E

Z

V

C

N

---

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M166 Datasheet(PDF) 71 Page - Siemens Semiconductor Group

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