mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 434

• Manufacturer Part Number: mc9s12xf512
• Description: S12x Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 11 Memory Mapping Control (S12XMMCV4) SUPPORTING FLEXRAY
11.4.2.6
Two bits in the MMCCTL1 register (ROMHM, RAMHM) configure the mapping of the local address
(0x4000-0x7FFF) in the global memory map.
ROMHM, RAMHM are write once in normal and emulation modes and anytime in special modes.
Three areas are identified (See
Table 11-18
consideration the different configurations of ROMHM and RAMHM.
Table 11-19
434
•
•
•
Normal Operation
During setup
0x4000 - 0x7FFF
0x2000 - 0x3FFF
0x2000 - 0x3FFF
Local Address
After reset
Program FLASH (0x7F_4000-0x7F_7FFF) when ROMHM = 0.
External Space (0x14_4000-0x14_7FFF) when ROMHM = 1 and RAMHM = 0.
XSRAM Space (0x0F_C000-0x0F_FFFF) when ROMHM = 1 and RAMHM = 1.
phase
shows the translation from the local memory map to the global memory map taking in
describes the application note of the RAM configuration and its dedicated global address.
Memory Configuration
(0x00 <= RPAGE <= 0xF9)
(0xFA <= RPAGE <= 0xFF)
ROMHM
RPAGE = 0xFD
RPAGE = 0xFD
Table 11-18. ROMHM and RAMHM Address Location
0
1
1
1
(Reset value)
(Reset value)
RPAGE
Figure
MC9S12XF - Family Reference Manual, Rev.1.19
RAMHM
X
0
1
0
Table 11-19. RAM Configuration
11-21):
0x0F_C000 - 0x0F_FFFF
0x0F_A000 - 0x0F_BFFF
0x0F_E000 - 0x0F_FFFF
0x7F_4000 - 0x7F_7FFF
0x14_4000 - 0x14_7FFF
ROMHM
Global Address
0
1
1
1
RAMHM
0
1
1
1
RAM AREA
12 Kilobytes
24 Kilobytes
28 Kilobytes
24 Kilobytes
Bottom of the Implemented RAM
Fixed up to 8K RAM
Fixed up to 8K RAM
External Space
Internal Flash
Location
0x0F_D000 - 0x0F_FFFF
0x0F_A000 - 0x0F_FFFF
0x0F_A000 - 0x0F_FFFF
0x00_0000 - 0x0F_9FFF
Freescale Semiconductor
Global Address