mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 551

• Manufacturer Part Number: mc9s12e256
• Description: Hcs12 Microcontrollers 16-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

19.3.2.9
Read: Anytime
Write: Determined at chip integration. Generally it’s: “write anytime in all modes;” on some devices it will
be: “write only in special modes.” Check specific device documentation to determine which applies.
Reset: Defined at chip integration as either 0x00 (paired with write in any mode) or 0x3C (paired with
write only in special modes), see
Freescale Semiconductor
1. The reset state of this register is controlled at chip integration. Please refer to
Reset
(MC9S12E256DGV1)”
W
R
1
Program Page Index Register (PPAGE)
—
0
7
As stated, the bits in this register provide read visibility to the system
memory space and on-chip/off-chip partitioning allocations defined at
system integration. The actual array size for any given type of memory
block may differ from the allocated size. Please refer to
“MC9S12E256 Device Overview (MC9S12E256DGV1)”
NOTES:
1. The ROMHM software bit in the MISC register determines the accessibility of the
FLASH/ROM memory space. Please refer to
1
(MEMSIZ1),” for a detailed functional description of the ROMHM bit.
pag_sw1:pag_sw0
= Unimplemented or Reserved
to determine the actual reset state of this register.
Table 19-11. Allocated FLASH/ROM Physical Memory Space
rom_sw1:rom_sw0
—
0
6
00
01
10
11
Figure 19-11. Program Page Index Register (PPAGE)
Table 19-12. Allocated Off-Chip Memory Options
00
01
10
11
Chapter 1, “MC9S12E256 Device Overview
PIX5
MC9S12E256 Data Sheet, Rev. 1.08
—
5
Off-Chip Space
876K bytes
768K bytes
512K bytes
PIX4
NOTE
0K byte
—
4
Section 19.3.2.8, “Memory Size Register
PIX3
—
3
Allocated FLASH
or ROM Space
48K bytes
64K bytes
Chapter 1, “MC9S12E256 Device Overview
16K bytes
0K byte
Chapter 19 Module Mapping Control (MMCV4)
On-Chip Space
Chapter 1,
PIX2
128K bytes
256K bytes
512K bytes
for actual sizes.
—
1M byte
2
(1)
(1)
(MC9S12E256DGV1)”.
PIX1
—
1
PIX0
—
0
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