參數(shù)資料
型號： MC68HC11F1CFN2R2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, EEPROM, 2 MHz, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁數(shù)： 104/163頁
文件大?。?/td> 711K
代理商： MC68HC11F1CFN2R2
MC68HC11F1
OPERATING MODES AND ON-CHIP MEMORY
MOTOROLA
TECHNICAL DATA
4-7
Notes:
1. Bits 1 and 0 can be written once only in first 64 cycles. When SMOD = 1, these bits can be written any time. All
other bits can be written at any time.
2. Bits can be written to zero (protection disabled) once only in first 64 cycles or at any time in special modes. Bits
can be set to one at any time.
3. Bits 5, 4, 2, 1, and 0 can be written once only in first 64 cycles. When SMOD = 1, bits 5, 4, 2, 1, and 0 can be
written at any time. All other bits can be written at any time
4. Bit 5 (CLK4X) can be written only one time.
5. Bit 4 (IRV) can be written only one time.
6. Can be written once in first 64 cycles after reset in normal modes or at any time in special modes.
4.3.1 Mode Selection
The four mode variations are selected by the logic levels present on the MODA and
MODB pins at the rising edge of RESET. The MODA and MODB logic levels determine
the logic state of SMOD and MDA control bits in the HPRIO register.
After reset is released, the mode select pins no longer influence the MCU operating
mode. In single-chip operating mode, the MODA pin is connected to a logic level zero.
In expanded mode, MODA should be connected to VDD through a pull-up resistor of
4.7 k
. The MODA pin also functions as the load instruction register (LIR) pin when
the MCU is not in reset. The open-drain active low LIR output pin drives low during the
first E cycle of each instruction (opcode fetch). The MODB pin also functions as stand-
by power input (VSTBY), which allows RAM contents to be maintained in absence of
VDD. Refer to APPENDIX A ELECTRICAL CHARACTERISTICS for VSTBY voltage
requirements.
Refer to Table 4-3, which is a summary of mode pin operation, the mode control bits,
and the four operating modes.
Table 4-2 Write Access Limited Registers
Register
Address
Register
Name
Must be Written in
First 64 Cycles
Write One Time
Only
$x024
Timer Interrupt Mask 2 (TMSK2)
Note 1
—
$x035
Block Protect Register (BPROT)
Note 2
—
$x038
System Configuration Options 2 (OPT2)
No
Note 4
$x039
System Configuration Options (OPTION)
Note 3
—
$x03C
Highest Priority I-bit and Miscellaneous (HPRIO)
No
Note 5
$x03D
RAM and I/O Map Register (INIT)
Yes
Note 6
Table 4-3 Hardware Mode Select Summary
Input Levels
at Reset
Mode
Control Bits in HPRIO
(Latched at Reset)
MODB
MODA
RBOOT
SMOD
MDA
1
0
Single Chip
0
1
Expanded
0
1
0
Special Bootstrap
1
0
1
Special Test
0
1
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