MC68HC705P9CDW FREESCALE [Freescale Semiconductor, Inc], MC68HC705P9CDW Datasheet - Page 38

• Manufacturer Part Number: MC68HC705P9CDW
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Memory
3.6.1.1 EPROM Programming Register
Technical Data
38
NOTE:
$001C
Reset:
Read:
Write:
The EPROM programming register contains the control bits for
programming the EPROM/OTPROM.
LATCH — EPROM Bus Latch
EPGM bit— EPROM Programming
Writing logic ones to both the LATCH and EPGM bits with a single
instruction sets LATCH and clears EPGM. LATCH must be set first by a
separate instruction.
Bits 7–3 and Bit 1— Reserved
This read/write bit latches the address and data buses for
EPROM/OTPROM programming. Clearing the LATCH bit
automatically clears the EPGM bit. EPROM/OTPROM data cannot be
read while the LATCH bit is set. Resets clear the LATCH bit.
This read/write bit applies the voltage from the IRQ/V
EPROM/OTPROM. To write the EPGM bit, the LATCH bit must
already be set. Clearing the LATCH bit also clears the EPGM bit.
Resets clear the EPGM bit.
Bits 7–3 and bit 1 are factory test bits that always read as logic zeros.
Freescale Semiconductor, Inc.
For More Information On This Product,
R = Reserved
1 = Address and data buses configured for EPROM/OTPROM
0 = Address and data buses configured for normal operation
1 = EPROM/OTPROM programming power switched on
0 = EPROM/OTPROM programming power switched off
Figure 3-3. EPROM Programming Register (EPROG)
Bit 7
R
0
0
programming
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R
6
0
0
Memory
R
5
0
0
R
4
0
0
R
3
0
0
LATCH
MC68HC705P9 — Rev. 4.0
2
0
PP
R
1
0
0
pin to the
MOTOROLA
EPGM
Bit 0
0