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參數(shù)資料
| 型號(hào)： | MCC68HC711D3 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, UUC |
| 封裝： | DIE |
| 文件頁(yè)數(shù)： | 83/157頁(yè) |
| 文件大?。?/td> | 2252K |
| 代理商： | MCC68HC711D3 |
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Operating Modes and Memory
Programmable Read-Only Memory (PROM)
MC68HC711D3 — Rev. 2
Data Sheet
MOTOROLA
Operating Modes and Memory
31
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
Always read 0.
NOCOP — Computer Operating Properly System Disable Bit
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.
1 = COP system is disabled.
0 = COP system is enabled, reset forced on timeout.
ROMON — PROM Enable Bit
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).
1 = PROM is present in the memory map.
0 = PROM is disabled from the memory map.
NOTE:
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.
2.4 Programmable Read-Only Memory (PROM)
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 (VPP). Normal programming is accomplished using the
OTPROM programming register (PPROG).
Address: $003F
Bit 7
654321
Bit 0
Read:
00000
NOCOP
ROMON
0
Write:
Reset:
00000
U
0
U = Unaffected
Figure 2-4. Configuration Control Register (CONFIG)
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