PC912XDP512F0MPVR datasheet(668/1348 Pages) FREESCALE

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Chapter 18 Memory Mapping Control (S12XMMCV3)

MC9S12XDP512 Data Sheet, Rev. 2.21

668

Freescale Semiconductor

The ﬁxed 16K page from 0x4000–0x7FFF (when ROMHM = 0) is the page number 0xFD.

The reset value of 0xFE ensures that there is linear Flash space available between addresses 0x4000 and

0xFFFF out of reset.

The ﬁxed 16K page from 0xC000-0xFFFF is the page number 0xFF.

18.3.2.9

RAM Write Protection Control Register (RAMWPC)

Read: Anytime

Write: Anytime

Table 18-14. PPAGE Field Descriptions

Field

Description

7–0

PIX[7:0]

Program Page Index Bits 7–0 — These page index bits are used to select which of the 256 FLASH or ROM

array pages is to be accessed in the Program Page Window.

Address: 0x011C

76543210

Reset

00000000

= Unimplemented or Reserved

Figure 18-17. RAM Write Protection Control Register (RAMWPC)

Table 18-15. RAMWPC Field Descriptions

Field

Description

RWPE

RAM Write Protection Enable — This bit enables the RAM write protection mechanism. When the RWPE bit

is cleared, there is no write protection and any memory location is writable by the CPU module and the XGATE

module. When the RWPE bit is set the write protection mechanism is enabled and write access of the CPU or

to the XGATE RAM region. Write access performed by the XGATE module to outside of the XGATE RAM region

or the shared region is suppressed as well in this case.

0 RAM write protection check is disabled, region boundary registers can be written.

1 RAM write protection check is enabled, region boundary registers cannot be written.

AVIE

CPU Access Violation Interrupt Enable — This bit enables the Access Violation Interrupt. If AVIE is set and

AVIF is set, an interrupt is generated.

0 CPU Access Violation Interrupt Disabled.

1 CPU Access Violation Interrupt Enabled.

AVIF

CPU Access Violation Interrupt Flag — When set, this bit indicates that the CPU has tried to write a memory

location inside the XGATE RAM region. This ﬂag can be reset by writing ’1’ to the AVIF bit location.

0 No access violation by the CPU was detected.

1 Access violation by the CPU was detected.

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