mc9s12e256 Freescale Semiconductor, Inc, mc9s12e256 Datasheet - Page 549

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

19.3.2.7
Read: Anytime
Write: Writes have no effect
Reset: Defined at chip integration, see
(MC9S12E256DGV1)”.
The MEMSIZ0 register reflects the state of the register, EEPROM and RAM memory space configuration
switches at the core boundary which are configured at system integration. This register allows read
visibility to the state of these switches.
Freescale Semiconductor
RAM_SW[2:0]
EEP_SW[1:0]
REG_SW0
Reset
ram_sw2:ram_sw0
Field
5:4
W
7
2
R REG_SW0
000
001
010
011
Memory Size Register 0 (MEMSIZ0)
—
Allocated System Register Space
0 Allocated system register space size is 1K byte
1 Allocated system register space size is 2K byte
Allocated System EEPROM Memory Space — The allocated system EEPROM memory space size is as
given in
Allocated System RAM Memory Space — The allocated system RAM memory space size is as given in
Table
7
19-9.
= Unimplemented or Reserved
Table
eep_sw1:eep_sw0
—
19-8.
0
6
RAM Space
Allocated
Figure 19-9. Memory Size Register 0 (MEMSIZ0)
2K bytes
4K bytes
6K bytes
8K bytes
Table 19-8. Allocated EEPROM Memory Space
00
01
10
11
Table 19-9. Allocated RAM Memory Space
Table 19-7. MEMSIZ0 Field Descriptions
EEP_SW1
MC9S12E256 Data Sheet, Rev. 1.08
—
5
Chapter 1, “MC9S12E256 Device Overview
Mappable Region
EEP_SW0
8K bytes
2K bytes
4K bytes
8K bytes
—
4
RAM
Description
Allocated EEPROM Space
2
—
3
0
2K bytes
4K bytes
8K bytes
0K byte
Chapter 19 Module Mapping Control (MMCV4)
RAM[15:11]
RAM[15:12]
RAM[15:13]
RAM[15:13]
Bits Used
RAM_SW2
INITRM
—
2
RAM_SW1
—
1
Base Address
RAM Reset
0x0800
0x0000
0x0800
0x0000
RAM_SW0
—
0
1
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