Datasheet

Chapter 1 MC9S12E256 Device Overview (MC9S12E256DGV1)

MC9S12E256 Data Sheet, Rev. 1.10

56 Freescale Semiconductor

1.2.2 Part ID Assignments

The part ID is located in two 8-bit registers PARTIDH and PARTIDL (addresses 0x001A and 0x001B after

reset. The read-only value is a unique part ID for each revision of the chip. Table 1-2 shows the assigned

part ID numbers.

The device memory sizes are located in two 8-bit registers MEMSIZ0 and MEMSIZ1 (addresses 0x001C

and 0x001D after reset). Table 1-3 shows the read-only values of these registers. Refer to Chapter 19,

“Module Mapping Control (MMCV4) Block Description” for further details.

Table 1-2. Assigned Part ID Numbers

Device Mask Set Number Part ID

The coding is as follows:

Bit 15–12: Major family identiﬁer

Bit 11–8: Minor family identiﬁer

Bit 7–4: Major mask set revision number including FAB transfers

Bit 3–0: Minor — non full — mask set revision

MC9S12E256 0L43X 0x5000

Table 1-3. Memory Size Registers

Device Register name Value

MC9S12E256 MEMSIZ0 0x07

MC9S12E256 MEMSIZ1 0x81