STMicroelectronics ST10 Series Programming Manual page 77

EXTP
Syntax
Operation
Description
Overrides the standard DPP addressing scheme of the long and indirect addressing modes for a specified
number of instructions. During their execution, both standard and PEC interrupts and class A hardware
traps are locked. The EXTP instruction becomes immediately active such that no additional NOPs are
required.
For any long ('mem') or indirect ([...]) address in the EXTP instruction sequence, the 10-bit page number
(address bits A23-A14) is not determined by the contents of a DPP register but by the value of op1 itself.
The 14-bit page offset (address bits A13-A0) is derived from the long or indirect address as usual.The
value of op2 defines the length of the effected instruction sequence.
Note: The EXTP instruction must be used carefully (see Section 2.7 - ATOMIC and EXTended instruc-
tions on page 38).
Flags
E
-
E Not affected
Z Not affected
V Not affected
C Not affected
N Not affected
Addressing Modes
Mnemonic
EXTP Rwm, #data
EXTP #pag, #data
Begin EXTended Page Sequence
EXTP op1, op2
(count) <-- (op2)
Disable interrupts and Class A traps
Data_Page = (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
Z
-
Format
DC 01##:m
2
D7 01##:0 pp 0:00pp
2
ST10 FAMILY PROGRAMMING MANUAL
[1 ≤ op2 ≤ 4]
V C
- -
N
-
Bytes
2
4
75/172