MC68HC705K1 Datasheet, PDF (95/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Personality EPROM (PEPROM)
PEPROM Registers
10.3.2 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 row zero flag.
Address: $000F
Bit 7
6
5
4
3
2
1
Bit 0
Read: PEDATA
PEPRZF
0
PEPGM
0
0
0
0
Write:
Reset: U
0
0
0
0
0
0
1
= Unimplemented
U = Unaffected
Figure 10-3. PEPROM Status and Control Register (PESCR)
PEDATA — PEPROM Data Bit
This read-only bit is the state of the PEPROM sense amplifier and
shows the state of the currently selected bit. Reset does not affect the
PEDATA bit.
1 = PEPROM data logic 1
0 = PEPROM data logic 0
PEPGM — PEPROM Program Control Bit
This read/write bit controls the switches that apply the programming
voltage, V_PP, to the selected PEPROM cell. Reset clears PEPGM.
1 = Programming voltage applied
0 = Programming voltage not applied
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
access one byte of PEPROM. Reset sets PEPRZF.
1 = Row zero selected
0 = Row zero not selected
MC68HC705K1 — Rev. 2.0
Personality EPROM (PEPROM)
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Technical Data