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HC705RC17GRS/D bảng dữ liệu(PDF) 94 Page - NXP Semiconductors

tên linh kiện HC705RC17GRS/D
Giải thích chi tiết về linh kiện  The MC68HC705RC17 is a general-purpose, low-cost addition to the M68HC05 Family of microcontroller units (MCUs) and is suitable for remote control applications.
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EPROM
General Release Specification
MC68HC705RC17 — Rev. 3.0
EPROM
11.4.3 Mask Option Registers (MOR1 and MOR2)
The mask option registers contain programmable EPROM bits to control
mask options. The MOR register is latched at the end of reset and
refreshed periodically depending on how often the EPROM is read.
PBXPU — Port B Pullup (X is 7–0)
When set, the PBPU bit enables the pullup on the corresponding port
B pin. If the PBPU bit is cleared, the pullup devices are disabled. The
erased state of the PBPU bit is to be cleared, thereby disabling the
pullup devices.
NOTE:
The MOR registers are reset to zero during reset. This causes the port
B pullup devices to become inactive until reset is completed.
SECUR — SECURITY Enable
1 = This bit secures the EPROM by disabling a read of the EPROM
in all modes other than user. This bit also disables writes to the
MOR registers and the programming register.
0 = The EPROM can be read in all modes.
Address:
$3FF0
Bit 7
654321
Bit 0
Read:
SECUR
IRQ
STOP
COP
Write:
Reset:
00000000
= Unimplemented
Figure 11-5. Mask Option Register 1 (MOR1)
Address:
$3FF1
Bit 7
654321
Bit 0
Read:
PB7PU
PB6PU
PB5PU
PB4PU
PB3PU
PB2PU
PB1PU
PB0PU
Write:
Reset:
00000000
Figure 11-6. Mask Option Register 2 (MOR2)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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