mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 614

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 22 Module Mapping Control (MMCV4)
22.3.2.9
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 device overview chapter.
614
1. The reset state of this register is controlled at chip integration. Please refer to the device overview section to determine the
Reset
actual reset state of this register.
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 the device overview
chapter for actual sizes.
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
Table 22-11. Allocated FLASH/ROM Physical Memory Space
rom_sw1:rom_sw0
—
0
6
00
01
10
11
Figure 22-11. Program Page Index Register (PPAGE)
Table 22-12. Allocated Off-Chip Memory Options
00
01
10
11
MC9S12HZ256 Data Sheet, Rev. 2.05
PIX5
—
5
Off-Chip Space
876K bytes
768K bytes
512K bytes
PIX4
NOTE
0K byte
—
4
Section 22.3.2.8, “Memory Size Register
PIX3
—
3
Allocated FLASH
or ROM Space
48K bytes
64K bytes
16K bytes
0K byte
On-Chip Space
128K bytes
256K bytes
512K bytes
PIX2
—
1M byte
2
(1)
(1)
Freescale Semiconductor
PIX1
—
1
PIX0
—
0