PC912XDP512F0CFVR datasheet(664/1348 Pages) FREESCALE

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Chapter 18 Memory Mapping Control (S12XMMCV3)

MC9S12XDP512 Data Sheet, Rev. 2.21

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Freescale Semiconductor

18.3.2.6

RAM Page Index Register (RPAGE)

Read: Anytime

Write: Anytime

These eight index bits are used to page 4 KByte blocks into the RAM page window located in the local

(CPU or BDM) memory map from address 0x1000 to address 0x1FFF (see Figure 18-12). This supports

accessing up to 1022 Kbytes of RAM (in the Global map) within the 64 KByte Local map. The RAM page

index register is effectively used to construct paged RAM addresses in the Local map format.

CAUTION

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

of this register could lead to unexpected results.

Table 18-11. Data Sources when CPU or BDM is Accessing Flash Area

Chip Modes

ROMON

EROMON

DATA SOURCE1

1 Internal Flash means Flash resources inside the MCU are read/written.

Emulation memory means resources inside the emulator are read/written (PRU registers, ﬂash

replacement, RAM, EEPROM and register space are always considered internal).

External application means resources residing outside the MCU are read/written.

Stretch2

2 The external access stretch mechanism is part of the EBI module (refer to EBI Block Guide for details).

Normal Single Chip

Internal Flash

Special Single Chip

Emulation Single Chip

Emulation Memory

Internal Flash

Normal Expanded

External Application

Internal Flash

Emulation Expanded

External Application

Emulation Memory

Internal Flash

Special Test

External Application

Internal Flash

Address: 0x0016

76543210

RP7

RP6

RP5

RP4

RP3

RP2

RP1

RP0

Reset

11111101

Figure 18-11. RAM Page Index Register (RPAGE)

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