Freescale Semiconductor HCS08 Series, Reference Manual

Page: 76 / 306

Chapter 5 Resets, Interrupts, and System Configuration
MC9S08JS16 MCU Series Reference Manual, Rev. 4
76 Freescale Semiconductor
5.7.8 System Device Identification Register (SDIDH, SDIDL)
This read-only register is 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.
Table 5-9. SIGNATURE Register Field Descriptions
Field Description
7:0
The SIGNATURE semaphore is used as the semaphore to jump to bootloader mode or not after regular reset.
This byte only can be cleared by power-on reset (POR), content retains after regular reset.
7 6 5 4 3 2 1 0
R ID11 ID10 ID9 ID8
W
Reset — — — — 0 0 0 0
= Unimplemented or Reserved
Figure 5-9. System Device Identification Register — High (SDIDH)
Table 5-10. 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
MC9S08JS16 series are hard coded to the value 0x024. See also ID bits in Table 5-11 .
7 6 5 4 3 2 1 0
R ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0
W
Reset 0 0 1 0 0 1 0 0
= Unimplemented or Reserved
Figure 5-10. System Device Identification Register — Low (SDIDL)
Table 5-11. 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
MC9S08JS16 series are hard coded to the value 0x024. See also ID bits in Table 5-10 .