Freescale Semiconductor, Inc.
Personality EPROM
PEPROM Registers
12.3 PEPROM Re g iste rs
Two I/O registers control programming and reading of the PEPROM:
• The PEPROM bit select register (PEBSR)
• The PEPROM status and control register (PESCR)
12.3.1 PEPROM Bit Se le c t Re g iste r (PEBSR)
The PEPROM bit select register (PEBSR) selects one of 64 bits in the
PEPROM array. Reset clears all the bits in the PEPROM bit select
register.
$000E
Read:
Write:
Reset:
Bit 7
PEB7
0
6
PEB6
0
5
PEB5
0
4
PEB4
0
3
PEB3
0
2
PEB2
0
1
PEB1
0
Bit 0
PEB0
0
Figure 12-2. PEPROM Bit Select Register (PEBSR)
PEB7 and PEB6 — Not connected to the PEPROM array
These read/write bits are available as storage locations. Reset clears
PEB7 and PEB6.
PEB5–PEB0 — PEPROM Bit Select Bits
These read/write bits select one of 64 bits in the PEPROM as shown
in Table 12-1. Bits PEB2–0 select the PEPROM row, and bits
PEB5–PEB3 select the PEPROM column. Reset clears PEB5–PEB0,
selecting the PEPROM bit in row zero, column zero.
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
General Release Specification
Personality EPROM
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