PC912XDP512F0MPVR datasheet(626/1348 Pages) FREESCALE

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Chapter 17 Memory Mapping Control (S12XMMCV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

626

Freescale Semiconductor

17.3.2.7

EEPROM Page Index Register (EPAGE)

Read: Anytime

Write: Anytime

The EEPROM page index register allows accessing up to 256 Kbyte of EEPROM in the global memory

map by using the eight page index bits to page 1 Kbyte blocks into the EEPROM page window located in

the local CPU memory map from address $0800 to address $0BFF (see Figure 1-14).

CAUTION

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

of this register could lead to unexpected results.

Figure 17-14. EPAGE Address Mapping

The reset value of $FE ensures that there is a linear EEPROM space available between addresses $0800

and $0FFF out of reset.

The ﬁxed 1K page $0C00–$0FFF of EEPROM is equivalent to page 255 (page number $FF).

Address: 0x0017

76543210

EP7

EP6

EP5

EP4

EP3

EP2

EP1

EP0

Reset

11111110

Figure 17-13. EEPROM Page Index Register (EPAGE)

Table 17-12. EPAGE Field Descriptions

Field

Description

7–0

EP[7:0]

EEPROM Page Index Bits 7–0 — These page index bits are used to select which of the 256 EEPROM array

pages is to be accessed in the EEPROM Page Window.

Bit16

Bit0

Bit9

Address [9:0]

EPAGE Register [7:0]

Global Address [22:0]

Bit10

Bit17

Address: CPU Local Address

or BDM Local Address

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