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參數(shù)資料
| 型號(hào)： | MC68HC912BL16FU8 |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁(yè)數(shù)： | 85/128頁(yè) |
| 文件大?。?/td> | 532K |
| 代理商： | MC68HC912BL16FU8 |
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MOTOROLA
MC68HC912BL16
6
MC68HC912BL16TS/D
2 Central Processing Unit
The CPU12 is a high-speed, 16-bit processing unit. It has full 16-bit data paths and wider internal reg-
isters (up to 20 bits) for high-speed extended math instructions. The instruction set is a proper superset
of the M68HC11instruction set. The CPU12 allows instructions with odd byte counts, including many
single-byte instructions. This provides efficient use of ROM space. An instruction queue buffers pro-
gram information so the CPU always has immediate access to at least three bytes of machine code at
the start of every instruction. The CPU12 also offers an extensive set of indexed addressing capabilities.
2.1 Programming Model
CPU12 registers are an integral part of the CPU and are not addressed as if they were memory loca-
tions.
Figure 2 Programming Model
Accumulators A and B are general-purpose 8-bit accumulators used to hold operands and results of
arithmetic calculations or data manipulations. Some instructions treat the combination of these two 8-
bit accumulators as a 16-bit double accumulator (accumulator D).
Index registers X and Y are used for indexed addressing mode. In the indexed addressing mode, the
contents of a 16-bit index register are added to 5-bit, 9-bit, or 16-bit constants or the content of an ac-
cumulator to form the effective address of the operand to be used in the instruction.
Stack pointer (SP) points to the last stack location used. The CPU12 supports an automatic program
stack that is used to save system context during subroutine calls and interrupts, and can also be used
for temporary storage of data. The stack pointer can also be used in all indexed addressing modes.
Program counter is a 16-bit register that holds the address of the next instruction to be executed. The
program counter can be used in all indexed addressing modes except auto-increment/decrement.
Condition Code Register (CCR) contains five status indicators, two interrupt masking bits, and a
STOP disable bit. The five flags are half carry (H), negative (N), zero (Z), overflow (V), and carry/borrow
(C). The half-carry flag is used only for BCD arithmetic operations. The N, Z, V, and C status bits allow
for branching based on the results of a previous operation.
7
15
D
IX
IY
SP
PC
A
B
N
S X H I
Z V C
0
7
0
CONDITION CODE REGISTER
8-BIT ACCUMULA
TORS A & B
16-BIT DOUBLE ACCUMULA
TORD
INDEX REGISTER X
INDEX REGISTERY
STACKPOINTER
PROGRAM COUNTER
OR
HC12 PROG MODEL
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| MC68HC916P1CAA16 | 功能描述:16位微控制器 - MCU 16B MCU 32K FLASH RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT |
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