MC68HC705JP7 Datasheet, PDF (178/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Personality EPROM (PEPROM)
12.3.2 PEPROM Status and Control Register
The PEPROM status and control register (PESCR) controls the
PEPROM programming voltage. This register also transfers the
PEPROM bits to the internal data bus and contains a flag bit when row
zero is selected.
Address: $000F
Bit 7
6
5
4
3
2
1
Bit 0
Read: PEDATA 0
0
0
0
0
PEPRZF
PEPGM
Write:
R
R
R
Reset: U
0
0
0
0
0
0
1
= Unimplemented
R = Reserved
U = Unaffected
Figure 12-3. PEPROM Status and Control Register (PESCR)
PEDATA — PEPROM Data Bit
This read-only bit is the output state of the PEPROM sense amplifier
and shows the state of the currently selected bit. The state of the
PEDATA bit does not affect the programming of the bit selected by the
PEBSR. Reset does not affect the PEDATA bit.
1 = PEPROM data is a logic 1.
0 = PEPROM data is a logic 0.
PEPGM — PEPROM Program Control Bit
This read/write bit controls the switches that apply the programming
voltage from the IRQ/V_PP pin to the selected PEPROM bit cell. When
the PEPGM bit is set, the selected bit cell will be programmed to a
logic 1, regardless of the state of the PEDATA bit. Reset clears the
PEPGM bit.
1 = Programming voltage applied to array bit
0 = Programming voltage not applied to array bit
PEPRZF — PEPROM Row Zero Flag
This read-only bit is set when the PEPROM bit select register selects
the first row (row zero) of the PEPROM array. Selecting any other row
clears PEPRZF. Monitoring PEPRZF can reduce the code needed to
Advance Information
178
MC68HC705JJ7 • MC68HC705JP7 — REV 4
Personality EPROM (PEPROM)
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA