mc68hc11d0cfn2 Freescale Semiconductor, Inc, mc68hc11d0cfn2 Datasheet - Page 31

• Manufacturer Part Number: mc68hc11d0cfn2
• Description: M68hc11 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

2.4 Programmable Read-Only Memory (PROM)
MC68HC711D3 — Rev. 2
MOTOROLA
NOTE:
normal expanded mode, EPROM is enabled and located at $7000–$7FFF. Should
the user wish to be in expanded mode, but with EPROM mapped at $F000–$FFFF,
he must reset in single-chip mode, and write a 1 to the MDA bit in the HPRIO
register.
Bits 7–3 and 0 — Not implemented
NOCOP — Computer Operating Properly System Disable Bit
ROMON — PROM Enable Bit
In expanded mode out of reset, the EPROM or OTPROM is located at
$7000–$7FFF. In all other modes, the PROM resides at $F000–$FFFF.
The MC68HC711D3 has 4-Kbytes of one-time programmable read-only memory
(OTPROM). The PROM address is $F000–$FFFF in all modes except expanded
multiplexed. In expanded- multiplexed mode, the PROM is located at
$7000–$7FFF after reset.
The on-chip read-only memory (ROM) of an MC68HC711D3 is programmed in
MCU mode. In this mode, the PROM is programmed through the MCU in the
bootstrap or test modes. The erased state of a PROM byte is $FF.
Using the on-chip OTPROM programming feature requires an external 12-volt
nominal power supply (V
OTPROM programming register (PPROG).
Address: $003F
Always read 0.
This bit is cleared out of reset in normal modes (single chip and expanded),
enabling the COP system. It is writable only once after reset in these modes
(SMOD = 0). In the special modes (test and bootstrap) (SMOD = 1), this bit
comes out of reset set, and is writable any time.
This bit is set out of reset, enabling the EPROM or OTPROM in all modes. This
bit is writable once in normal modes (SMOD = 0), but is writable at any time in
special modes (SMOD = 1).
Reset:
Read:
Write:
1 = COP system is disabled.
0 = COP system is enabled, reset forced on timeout.
1 = PROM is present in the memory map.
0 = PROM is disabled from the memory map.
Freescale Semiconductor, Inc.
For More Information On This Product,
U = Unaffected
Bit 7
Figure 2-4. Configuration Control Register (CONFIG)
0
0
Operating Modes and Memory
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6
0
0
PP
). Normal programming is accomplished using the
5
0
0
4
0
0
Programmable Read-Only Memory (PROM)
3
0
0
Operating Modes and Memory
NOCOP
U
2
ROMON
U
1
Data Sheet
Bit 0
0
0
31