Chapter 23 Memory Mapping Control (S12XMMCV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
Freescale Semiconductor 895
23.3.2.8 Program Page Index Register (PPAGE)
Read: Anytime
Write: Anytime
The program page index register allows accessing up to 4 Mbyte of FLASH or ROM in the global memory
map by using the eight page index bits to page 16 Kbyte blocks into the program page window located in
the CPU local memory map from address $8000 to address $BFFF (see Figure 1-16). The CPU has a
special access to read and write this register during execution of CALL and RTC instructions.
CAUTION
XGATE write access to this register during an CPU access which makes use
of this register could lead to unexpected results.
Figure 23-16. PPAGE Address Mapping
NOTE
Writes to this register using the special access of the CALL and RTC
instructions will be complete before the end of the instruction execution.
Address: 0x0030
76543210
RPIX7 PIX6 PIX5 PIX4 PIX3 PIX2 PIX1 PIX0
W
Reset 11111110
Figure 23-15. Program Page Index Register (PPAGE)
Bit14 Bit0
1
Address [13:0]
PPAGE Register [7:0]
Global Address [22:0]
Bit13
Bit21
Address: CPU Local Address
or BDM Local Address