mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 56

• Manufacturer Part Number: mcf51ac256a
• Description: Mcf51ac Flexis
• Manufacturer: Freescale Semiconductor, Inc

Memory
oscillator trim values stored in flash IFR are replicated at the TRIM and FTRIM locations of the flash as
shown in
corresponding MCG registers (MCGTRM and MCGSC) by user code to override the factory trim.
Provided the key enable (KEYEN) bit is set, the 8-byte comparison key can be used to temporarily
disengage memory security. This key mechanism can be accessed only through user code running in secure
memory. (A security key cannot be entered directly through background debug commands.) This security
key can be disabled completely by programming the KEYEN bit to 0. If the security key is disabled, the
only way to disengage security is by mass-erasing the flash (normally through the background debug
interface) and verifying that flash is blank.
4.2.3
The rapid GPIO module is mapped into a 16-byte area starting at location 0x(00)C0_0000. Its memory
map is shown below in
4.2.4
The V1 ColdFire interrupt controller (CF1_INTC) register map is sparsely-populated, but retains
compatibility with earlier ColdFire interrupt controller definitions. The CF1_INTC occupies the upper
64 bytes of the system address space and all memory locations are accessed as 8-bit (byte) operands.
1.
4-12
Flash IFR — Nonvolatile information memory, consisting of 256 bytes, located in the flash block outside of flash main
memory.
0x(00)C0_000A
0x(00)C0_000B
0x(00)C0_000C
0x(00)C0_000D
0x(00)C0_000E
0x(00)C0_000F
0x(00)C0_0000
0x(00)C0_0001
0x(00)C0_0002
0x(00)C0_0003
0x(00)C0_0004
0x(00)C0_0005
0x(00)C0_0006
0x(00)C0_0007
0x(00)C0_0008
0x(00)C0_0009
Table
Register
Address
ColdFire Rapid GPIO Memory Map
ColdFire Interrupt Controller Memory Map
4-4. These can be reprogrammed by third party programmers and can be copied into the
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Table
RGPIO_DATA
RGPIO_DATA
RGPIO_ENB
RGPIO_ENB
RGPIO_TOG
RGPIO_TOG
RGPIO_CLR
RGPIO_CLR
RGPIO_SET
RGPIO_SET
RGPIO_DIR
RGPIO_DIR
Reserved
Reserved
Reserved
Reserved
Register
Name
Table 4-5. V1 ColdFire Rapid GPIO Memory Map
4-5.
Bit 7
15
15
15
15
15
15
—
—
—
—
7
7
7
7
7
7
14
14
14
14
—
—
14
—
—
14
6
6
6
6
6
6
6
13
13
13
13
13
13
—
—
—
—
5
5
5
5
5
5
5
12
12
12
12
12
12
—
—
—
—
4
4
4
4
4
4
4
11
11
11
11
11
11
—
—
—
—
3
3
3
3
3
3
3
10
10
10
10
—
—
10
—
—
10
2
2
2
2
2
2
2
Freescale Semiconductor
—
—
—
—
1
9
1
9
1
9
1
9
1
9
1
9
1
Bit 0
—
—
—
—
8
0
8
0
8
0
8
0
8
0
8
0