Motorola MPC533 Reference Manual page 826

Programming Model
Table 19-1. UC3F External Interface Signals (continued)
Mnemonic I/O Type
EPEE External
Program/Erase
B0EPEE Block 0
External
Program/Erase
19.2 Programming Model
The UC3F EEPROM module consists of a control register block, an addressable shadow
row implemented in Flash, and an addressable main Flash memory array. The control
registers are used to configure, program, erase and exercise the UC3F shadow row and
Flash array.
19.2.1 UC3F EEPROM Control Registers
The control registers are used to control UC3F EEPROM module operation. On reset, the
registers are loaded with default reset information. Several bits of the UC3F control
registers are special Flash NVM registers which retain their state when power is removed
from the UC3F EEPROM. These special NVM registers are identified in the individual
register field and control bit descriptions.
19.2.1.1 Register Addressing
The UC3F module control registers, shown in Table 19-2, are selected with individual
register selects generated from the BIU. As such, each Flash module that is designed using
the UC3F EEPROM module may uniquely define the addressing of the control register
block.
19-4
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Description
EPEE pin status The EPEE bit monitors the state of the external program/erase
enable (EPEE) input. The UC3F module samples the EPEE input
when EHV is asserted and holds that sampled state until EHV is
negated.
Block 0 The B0EM bit monitors the state of Block 0 EPEE, B0EPEE, input.
EPEE pin status The UC3F module samples the B0EPEE input when EHV is
asserted and holds that sampled value until EHV is negated.
If B0EM = 1 when EHV is asserted, high voltage operations such
as program or erase are enabled for either small block 0 or the
lowest numbered block of the UC3F array regardless of the state
of EPEE.
If B0EM = 0 when EHV is asserted, high voltage operations are
disabled for small block 0 or the lowest numbered block of the
UC3F array regardless of the state of EPEE.
MPC533 Reference Manual
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