Datasheet

Resource Mapping
MC9S12DP256 — Revision 1.1
Resource Mapping
This register determines the active page viewed through the Program
Page Window from $8000 – $BFFF. CALL and RTC instructions have
a special single wire mechanism to read and write this register without
using an address bus.
There are 256K bytes of Flash EEPROM. With a 64K byte address
space the PPAGE register is needed to perform on chip memory
expansion. A Program Page Window of 16K byte pages is located
from $8000 to $BFFF. Six page indices are used to point to one of 64
different 16K byte Flash EEPROM pages.
Read and write: anytime.
PIX5 – PIX0 — These six bits are used to select which of the 64 Flash
EEPROM array or expanded pages is currently being accessed.
PPAGE — (Program) Page Index Register
Address Offset: $0030
Bit 7 6 5 4 3 2 1 Bit 0
0 0 PIX5 PIX4 PIX3 PIX2 PIX1 PIX0
Reset:
0 0 0 0 0 0 0 0
Table 19 Program space page index
PIX5 PIX4 PIX3 PIX2 PIX1 PIX0 Program Space Selected
000000 External 16K Page 0
000001 External 16K Page 1
... ... ... ... ... ... External 16K Pages 2 .. $2E
10111116K Flash EEPROM Page $2F
11000016K Flash EEPROM Page $30
11000116K Flash EEPROM Page $31
11001016K Flash EEPROM Page $32
11001116K Flash EEPROM Page $33
11010016K Flash EEPROM Page $34
11010116K Flash EEPROM Page $35
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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