MC68HC05L28B MOTOROLA [Motorola, Inc], MC68HC05L28B Datasheet - Page 40

• Manufacturer Part Number: MC68HC05L28B
• Description: Flexible general-purpose microcomputer
• Manufacturer: MOTOROLA [Motorola, Inc]

3
3.4.1.3
3.4.1.4
3.4.1.5
Note:
3.4.2
MOTOROLA
3-4
EPROM program (PCR)
1 (set)
0 (clear) –
1 (set)
0 (clear) –
1 (set)
0 (clear) –
LATCH and EEPGM cannot be set on the same write operation
LATCH — EEPROM latch control
EERC — EEPROM RC oscillator control
EEPGM — EEPROM program control
EPROM programming register (PCR)
–
–
–
The EEPROM address and data buses are configured for
programming. This causes the address and data buses to be latched
when a write to EEPROM is carried out. EEPROM cannot be read if
LATCH = 1.
The EEPROM address and data buses are configured for normal
reads.
The EEPROM uses an internal RC oscillator instead of the CPU
clock. After setting, wait for time t
stabilize. It should be set by the user when the internal bus frequency
falls below 1.5 MHz.
The EEPROM uses the CPU clock.
Programming power is connected to the EEPROM array. EEPGM
can only be set if LATCH is set and is automatically cleared when
LATCH = 0.
Programming power is disconnected from the EEPROM array.
$001C
Address
MEMORY AND REGISTERS
bit 7
bit 6
bit 5
RCON
bit 4
to allow the RC oscillator to
bit 3
bit 2
ELAT
bit 1
MC68HC05L28
PGM uuuu uu00
bit 0
on reset
State
TPG