Datasheet

Chapter 5 Resets, Interrupts, and General System Control
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 5
72 Freescale Semiconductor
5.8.6 System Device Identification Register (SDIDH, SDIDL)
These high page read-only registers are included so host development systems can identify the HCS08
derivative and revision number. This allows the development software to recognize where specific
memory blocks, registers, and control bits are located in a target MCU.
Figure 5-7. System Device Identification Register — High (SDIDH)
76543210
R ID11 ID10 ID9 ID8
W
Reset: ———— 0000
= Unimplemented or Reserved
Table 5-8. SDIDH Register Field Descriptions
Field Description
7:4
Reserved
Bits 7:4 are reserved. Reading these bits will result in an indeterminate value; writes have no effect.
3:0
ID[11:8]
Part Identification Number — Each derivative in the HCS08 Family has a unique identification number. The
MC9S08QG8 is hard coded to the value 0x009. See also ID bits in Tabl e 5 -9 .
76543210
R ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0
W
Reset:00001001
= Unimplemented or Reserved
Figure 5-8. System Device Identification Register — Low (SDIDL)
Table 5-9. SDIDL Register Field Descriptions
Field Description
7:0
ID[7:0]
Part Identification Number — Each derivative in the HCS08 Family has a unique identification number. The
MC9S08QG8 is hard coded to the value 0x009. See also ID bits in Tabl e 5 -8 .