PC912XDP512F0MPVR datasheet(621/1348 Pages) FREESCALE

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Chapter 17 Memory Mapping Control (S12XMMCV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

621

17.3.2.3

Global Page Index Register (GPAGE)

Read: Anytime

Write: Anytime

The global page index register is used only when the CPU is executing a global instruction (GLDAA,

GLDAB, GLDD, GLDS, GLDX, GLDY,GSTAA, GSTAB, GSTD, GSTS, GSTX, GSTY) (see CPU Block

Guide). The generated global address is the result of concatenation of the CPU local address [15:0] with

the GPAGE register [22:16] (see Figure 1-7).

CAUTION

XGATE write access to this register during an CPU access which makes use

of this register could lead to unexpected results.

Figure 17-7. GPAGE Address Mapping

Example 17-1. This example demonstrates usage of the GPAGE register

LDAADR

EQU $5000

;Initialize LDADDR to the value of $5000

MOVB

#$14, GPAGE

;Initialize GPAGE register with the value of $14

GLDAA

>LDAADR

;Load Accu A from the global address $14_5000

Address: 0x0010

76543210

GP6

GP5

GP4

GP3

GP2

GP1

GP0

Reset

00000000

= Unimplemented or Reserved

Figure 17-6. Global Page Index Register (GPAGE)

Table 17-7. GPAGE Field Descriptions

Field

Description

6–0

GP[6:0]

Global Page Index Bits 6–0 — These page index bits are used to select which of the 128 64-kilobyte pages is

to be accessed.

Bit16

Bit 0

Bit15

Bit22

CPU Address [15:0]

GPAGE Register [6:0]

Global Address [22:0]

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