Chapter 3 4 Kbyte EEPROM Module (S12XEETX4KV2)
MC9S12XDP512 Data Sheet, Rev. 2.11
146 Freescale Semiconductor

3.1.4 Block Diagram

A block diagram of the EEPROM module is shown in .
3.2 External Signal Description
The EEPROM module contains no signals that connect off-chip.
3.3 Memory Map and Register Definition
This section describes the memory map and registers for the EEPROM module.

3.3.1 Module Memory Map

The EEPROM memory map is shown in . The HCS12X architecture places the EEPROM memory
addresses between global addresses . The EPROT register, described in Section 3.3.2.5, “EEPROM
Protection Register (EPROT)”, can be set to protect the upper region in the EEPROM memory from
accidental program or erase. The EEPROM addresses covered by this protectable region are shown in the
EEPROM memory map. The default protection setting is stored in the EEPROM configuration field as
described in Table 3-1.
Table 3-1. EEPROM Configuration Field
Global Address Size
(bytes) Description
0x13_FFFC 1 Reserved
0x13_FFFD 1 EEPROM Protection byte
Refer to Section 3.3.2.5, “EEPROM Protection Register (EPROT)”
0x13_FFFE – 0x13_FFFF 2 Reserved