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参数资料
| 型号： | MC68HC05V7FNR2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68 |
| 封装： | PLASTIC, LCC-68 |
| 文件页数： | 106/170页 |
| 文件大小： | 589K |
| 代理商： | MC68HC05V7FNR2 |
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MOTOROLA
SECTION 4: CPU CORE
Page 26
MC68HC05V7 Specification Rev. 1.0
In indexed addressing with no offset, the index register contains the low byte of the operand
address, and the high byte is assumed to be $00. In indexed addressing with an 8-bit offset,
the CPU finds the operand address by adding the index register contents to an 8-bit
immediate value. In indexed addressing with a 16-bit offset, the CPU finds the operand
address by adding the index register contents to a 16-bit immediate value
The index register can also serve as an auxiliary accumulator for temporary storage. The
index register is unaffected by a reset of the device.
4.1.3
STACK POINTER (SP)
The stack pointer shown in Figure 4-1 is a 16-bit register internally. In devices with memory
maps less than 64 Kbytes the unimplemented upper address lines are ignored. The stack
pointer contains the address of the next free location on the stack. During a reset or the
reset stack pointer (RSP) instruction, the stack pointer is set to $00FF. The stack pointer is
then decremented as data is pushed onto the stack and incremented as data is pulled from
the stack.
When accessing memory, the ten most significant bits are permanently set to 0000000011.
The six least significant register bits are appended to these ten fixed bits to produce an
address within the range of $00FF to $00C0. Subroutines and interrupts may use up to 64
($40) locations. If 64 locations are exceeded, the stack pointer wraps around and writes
over the previously stored information. A subroutine call occupies two locations on the
stack and an interrupt uses five locations.
4.1.4
PROGRAM COUNTER (PC)
The program counter shown in Figure 4-1 is a 16-bit register internally. In devices with
memory maps less than 64 Kbytes the unimplemented upper address lines are ignored.
The program counter contains the address of the next instruction or operand to be fetched.
Normally, the address in the program counter increments to the next sequential memory
location every time an instruction or operand is fetched. Jump, branch, and interrupt
operations load the program counter with an address other than that of the next sequential
location.
4.1.5
CONDITION CODE REGISTER (CCR)
The CCR shown in Figure 4-1 is a 5-bit register in which four bits are used to indicate the
results of the instruction just executed. The fifth bit is the interrupt mask. These bits can be
individually tested by a program, and specific actions can be taken as a result of their state.
The condition code register should be thought of as having three additional upper bits that
are always ones. Only the interrupt mask is affected by a reset of the device. The following
paragraphs explain the functions of the lower five bits of the condition code register.
4.1.5.1
Half Carry Bit (H-Bit)
When the half-carry bit is set, it means that a carry occurred between bits 3 and 4 of the
accumulator during the last ADD or ADC (add with carry) operation. The half-carry bit is
required for binary-coded decimal (BCD) arithmetic operations.
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