參數(shù)資料
型號(hào)： M68HC11D3CFB1
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 1 MHz, MICROCONTROLLER, PQFP44
封裝： QFP-44
文件頁數(shù)： 58/124頁
文件大?。?/td> 5398K
代理商： M68HC11D3CFB1
OPERATING MODES AND ON-CHIP MEMORY
TECHNICAL DATA
4-5
The bootloader program is contained in the 192-byte bootstrap ROM. This ROM,
which appears as internal memory space at locations $BF40–$BFFF, is enabled only
if the MCU is reset in special bootstrap mode.
Memory locations are the same for expanded multiplexed and single-chip modes, ex-
cept for ROM in expanded mode and the bootloader ROM in special bootstrap mode.
The on-board 192-byte RAM is initially located at $0040 after reset, but can be placed
at any other 4K boundary ($x040) by writing an appropriate value to the INIT register.
The 4 Kbyte ROM is located at $F000 through $FFFF in all modes except expanded
multiplexed, in which it is located at $7000. ROM can be located at $F000 in expanded
multiplexed by entering single-chip mode out of reset and setting the MDA bit in the
HPRIO register to 1, thereby entering expanded mode from internal ROM. Disable
ROM by clearing the ROMON bit in the CONFIG register.
Hardware priority is built into RAM and I/O remapping. Registers and RAM have prior-
ity over ROM. In the event of conflicts, the higher priority resource takes precedence.
The 192 bytes of fully static RAM store instructions, variables, and temporary data.
The direct addressing mode can access RAM locations using a one-byte address op-
erand, saving program memory space and execution time, depending on the applica-
tion. RAM contents are preserved during periods of processor inactivity by two
methods, both of which reduce power consumption.
In the software-based STOP mode, the clocks are stopped while VDD powers the
MCU. Because power supply current is directly related to operating frequency in
CMOS integrated circuits, only a very small amount of leakage exists when the clocks
are stopped.
$002B
TCLR
0
SCP1
SCP0
RCKB
SCR2
SCR1
SCR0
BAUD
$002C
R8
T8
0
M
WAKE
0
SCCR1
$002D
TIE
TCIE
RIE
ILIE
TE
RE
RWU
SBK
SCCR2
$002E
TDRE
TC
RDRF
IDLE
OR
NF
FE
0
SCSR
$002F
R7/T7
R6/T6
R5/T5
R4/T4
R3/T3
R2/T2
R1/T1
R0/T0
SCDR
$0030
Reserved
to
$0038
Reserved
$0039
0
IRQE
DLY
CME
0
CR1
CR0
OPTION
$003A
Bit 7
654321
Bit 0
COPRST
$003B
Reserved
$003C
RBOOT
SMOD
MDA
IRVNE
PSEL3
PSEL2
PSEL1
PSEL0
HPRIO
$003D
RAM3
RAM2
RAM1
RAM0
REG3
REG2
REG1
REG0
INIT
$003E
TILOP
0
OCCR
CBYP
DISR
FCM
FCOP
0
TEST1
$003F
00000
NOCOP
ROMON
0
CONFIG
Table 4-1 Register and Control Bit Assignments (Continued)
Bit 7
654321
Bit 0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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