MC9S08JM16CGTE FREESCALE [Freescale Semiconductor, Inc], MC9S08JM16CGTE Datasheet - Page 40

• Manufacturer Part Number: MC9S08JM16CGTE
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Chapter 4 Memory
4.2
The registers in the MC9S08JM16 series are divided into these three groups:
Direct-page registers can be accessed with efficient direct addressing mode instructions. Bit manipulation
instructions can be used to access any bit in any direct-page register.
user-accessible direct-page registers and control bits.
The direct-page registers in
the lower byte of the address. Because of this, the lower byte of the address in column one is shown in bold
text. In
and
the right. Cells that are not associated with named bits are shaded. A shaded cell with a 0 indicates this
unused bit always reads as a 0. Shaded cells with dashes indicate unused or reserved bit locations that could
read as 1s or 0s.
40
•
•
•
Table
Table 4-3
Direct-page registers are located in the first 176 locations in the memory map, so they are
accessible with efficient direct addressing mode instructions.
High-page registers are used much less often, so they are located above 0x1800 in the memory
map. This leaves more room in the direct page for more frequently used registers and variables.
The nonvolatile register area consists of a block of 16 locations in flash memory at
0xFFB0–0xFFBF.
Nonvolatile register locations include:
— Three values which are loaded into working registers at reset
— An 8-byte backdoor comparison key which optionally allows a user to gain controlled access
Register Addresses and Bit Assignments
4-4, the register names in column two are shown in bold to set them apart from the bit names to
to secure memory
Because the nonvolatile register locations are flash memory, they must be erased and
programmed like other flash memory locations.
and
Table
0xFFFC:FFFD
0xFFFE:FFFF
0xFFFA:FFFB
0xFFF6:FFF7
0xFFF8:FFF9
(High/Low)
Address
4-4, the whole address in column one is shown in bold. In
Table 4-2
Table 4-1. Reset and Interrupt Vectors (continued)
MC9S08JM16 Series Data Sheet, Rev. 2
can use more efficient direct addressing mode, which requires only
Low Voltage Detect
MCG Loss of Lock
Vector
Reset
SWI
IRQ
Table 4-2
Vector Name
Vreset
Vswi
Vlvd
Virq
Vlol
is a summary of all
Table
Freescale Semiconductor
4-2,
Table
4-3,