mcf51ac256a Freescale Semiconductor, Inc, mcf51ac256a Datasheet - Page 96

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

Resets, Interrupts, and General System Control
5.9.5
These high-page read-only registers are included so host development systems can identify the ColdFire
derivative. This allows the development software to recognize where specific memory blocks, registers,
and control bits are located in a target microcontroller.
Additional configuration information about the ColdFire core and memory system is loaded into the 32-bit
D0 (core) and D1 (memory) registers at reset. This information can be stored into memory by the system
startup code for later use by configuration-sensitive application code.
5.9.6
This register contains one read-only status flag, one write-only acknowledge bit, three read/write delay
selects, and one unimplemented bit, which always read 0.
5-14
Reserved
Reset:
Reset:
ID[11:8]
ID[7–0]
Field
Field
7–4
3–0
7–0
W
W
R
R
System Device Identification Register (SDIDH, SDIDL)
System Real-Time Interrupt Status and Control Register (SRTISC)
Reserved. Reading these bits will result in an indeterminate value; writes have no effect.
Part Identification Number — Each derivative in the ColdFire family has a unique identification number. The
MCF51AC256 series microcontrollers are hard coded to the value 0xC1B. See also ID bits in
ID7
Part Identification Number — Each derivative in the ColdFire family has a unique identification number. The
MCF51AC256 series microcontrollers are hard coded to the value 0xC1B. See also ID bits in
—
0
7
7
MCF51AC256 ColdFire Integrated Microcontroller Reference Manual, Rev. 5
Figure 5-5. System Device Identification Register — High (SDIDH)
Figure 5-6. System Device Identification Register — Low (SDIDL)
MCLK frequency = Bus clock frequency ÷ (2 * MCSEL)
ID6
—
0
6
6
Table 5-8. SDIDH Register Field Descriptions
Table 5-9. SDIDL Register Field Descriptions
ID5
—
0
5
5
ID4
—
1
4
4
Description
Description
ID11
ID3
3
1
3
1
ID10
ID2
1
0
2
2
Freescale Semiconductor
ID9
ID1
0
1
1
1
Table
Table
5-9.
5-8.
Eqn. 5-1
ID8
ID0
0
1
0
0