HCS08 datasheet(72/316 Pages) NXP

72 / 316 page

Chapter 5 Resets, Interrupts, and General System Control

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

5.7.5

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 5-6. System Device Identification Register — High (SDIDH)

321

ID11

ID10

ID9

ID8

Reset:

1 - Bit 7 is a mask option tie off that is used internally to determine that the device is a MC9S08SG8.

—

000

= Unimplemented or Reserved

Table 5-7. SDIDH Register Field Descriptions

Field

Description

Bit 7 will read as a 1 for the MC9S08SG8 devices; writes have no effect.

6:4

Reserved

Bits 6:4 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

MC9S08SG8 is hard coded to the value 0x014. See also ID bits in Table 5-8.

321

ID7

ID6

ID5

ID4

ID3

ID2

ID1

ID0

Reset:

000

100

= Unimplemented or Reserved

Figure 5-7. System Device Identification Register — Low (SDIDL)

Table 5-8. 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

MC9S08SG8 is hard coded to the value 0x014. See also ID bits in Table 5-7.

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