ST9 datasheet(20/146 Pages) STMICROELECTRONICS

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ST9 USER GUIDE

3.1.6.2 Defining Two Separate Groups of Eight Working Registers

In this mode, the srp instruction is not used. Instead, we use the pair of instructions srp0 and

srp1

. When using a working register, r0 to r7 address the first to the eighth register of the

whole group selected by half the value in RP0 i.e. all the registers of the half group selected by

RP0. Registers r8 to r15 relate to the first to the eighth register of the group pointed to by RP1.

Here is how the two blocks are selected:

Figure 8

. Register Numbers

Group F

paged registers

Group E

system registers

R255

R240

R239

R224

R223

R00

R15

R16

R31

R32

Groups 2 to C

R232

Lower part of Group 1

as working

RP0R loaded

using the

instruction code

srp0 #2

General Purpose

Registers

R233

R23

R24

RP1R loaded

using the

instruction code

srp1 #27

Upper part of Group D

as working

Group 0

R216

r15

Upper part of

group 1

Lower part of

group D

R208

R215

R207

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