S912XET256J2VAGR Freescale Semiconductor, S912XET256J2VAGR Datasheet - Page 214

• Manufacturer Part Number: S912XET256J2VAGR
• Description: 16-bit Microcontrollers - MCU Watchdog OSC/Timer -40 C to + 105 C HCS12X MCU SPI
• Manufacturer: Freescale Semiconductor

Specifications of S912XET256J2VAGR

• Core: HCS12X
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 50 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 16 KB
• On-chip Adc: Yes
• Package / Case: LQFP
• Mounting Style: SMD/SMT
• A/d Bit Size: 12 bit
• A/d Channels Available: 24
• Interface Type: CAN, SCI, SPI
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 119
• Number Of Timers: 25
• Program Memory Type: Flash
• Supply Voltage - Max: 1.98 V, 2.9 V, 5.5 V
• Supply Voltage - Min: 1.72 V, 2.7 V, 3.13 V

Chapter 3 Memory Mapping Control (S12XMMCV4)
3.4.2.5
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 3-19
consideration the different configurations of ROMHM and RAMHM.
Table 3-20
214
•
•
•
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
0
1
1
1
Table 3-19. ROMHM and RAMHM Address Location
(Reset value)
(Reset value)
RPAGE
Figure
MC9S12XE-Family Reference Manual Rev. 1.25
RAMHM
X
0
1
0
Table 3-20. RAM Configuration
3-21):
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