參數(shù)資料
型號(hào): MC68HC05F4FB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 119/130頁
文件大?。?/td> 2089K
代理商: MC68HC05F4FB
MC68HC05F4
MOTOROLA
9-7
CPU CORE AND INSTRUCTION SET
9
9.3.3
Direct
In the direct addressing mode, the effective address of the argument is contained in a single byte
following the opcode byte. Direct addressing allows the user to directly address the lowest 256
bytes in memory with a single two-byte instruction.
EA = (PC+1); PC
← PC+2
Address bus high
← 0; Address bus low ← (PC+1)
Table 9-3 Branch instructions
Relative addressing mode
Function
Mnemonic
Opcode
# Bytes # Cycles
Branch always
BRA
20
2
3
Branch never
BRN
21
2
3
Branch if higher
BHI
22
2
3
Branch if lower or same
BLS
23
2
3
Branch if carry clear
BCC
24
2
3
(Branch if higher or same)
(BHS)
24
2
3
Branch if carry set
BCS
25
2
3
(Branch if lower)
(BLO)
25
2
3
Branch if not equal
BNE
26
2
3
Branch if equal
BEQ
27
2
3
Branch if half carry clear
BHCC
28
2
3
Branch if half carry set
BHCS
29
2
3
Branch if plus
BPL
2A
2
3
Branch if minus
BMI
2B
2
3
Branch if interrupt mask bit is clear
BMC
2C
2
3
Branch if interrupt mask bit is set
BMS
2D
2
3
Branch if interrupt line is low
BIL
2E
2
3
Branch if interrupt line is high
BIH
2F
2
3
Branch to subroutine
BSR
AD
2
6
Table 9-4 Bit manipulation instructions
Addressing modes
Bit set/clear
Bit test and branch
Function
Mnemonic
Opcode
# Bytes # Cycles
Opcode
# Bytes # Cycles
Branch if bit n is set
BRSET n (n=07)
2n
3
5
Branch if bit n is clear
BRCLR n (n=07)
01+2n
3
5
Set bit n
BSET n (n=07)
10+2n
2
5
Clear bit n
BCLR n (n=07)
11+2n
2
5
TPG
85
05F4Book Page 7 Tuesday, August 5, 1997 1:10 pm
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