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参数资料
| 型号： | EM78459 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 14-SOIC |
| 中文描述： | 8位微控制器的通用产品 |
| 文件页数： | 55/57页 |
| 文件大小： | 854K |
| 代理商： | EM78459 |
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EM78458/459
MASK ROM
This specification is subject to change without prior notice.
2002/03/01
7
The contents of R2 are set to all "0"s upon a RESET condition.
"JMP" instruction allows the direct loading of the lower 10 program counter bits. Thus, "JMP" allows
PC to jump to any location within a page.
"CALL" instruction loads the lower 10 bits of the PC, and then PC+1 is pushed into the stack. Thus,
the subroutine entry address can be located anywhere within a page.
"RET" ("RETL k", "RETI") instruction loads the program counter with the contents of the top of stack.
"ADD R2, A" allows a relative address to be added to the current PC, and the ninth and tenth bits of
the PC are cleared.
"MOV R2, A" allows to load an address from the "A" register to the lower 8 bits of the PC, and the
ninth and tenth bits of the PC are cleared.
Any instruction that is written to R2 (e.g. "ADD R2, A", "MOV R2, A", "BC R2, 6",
) will cause the
ninth bit and the tenth bit (A8~A9) of the PC to be cleared. Thus, the computed jump is limited to the
first 256 locations of a page.
In the case of EM78458/459, the most two significant bits (A11 and A10) will be loaded with the
content of PS1 and PS0 in the status register (R3) upon the execution of a "JMP", "CALL", or any
other instructions set which write to R2.
All instructions are single instruction cycle (fclk/2 or fclk/4) except for the instructions which write to
R2, need one more instruction cycle.
A9 ~ A8
A11~A10
A7
~
A0
Page 0
Page 1
Page 2
Page 3
000
3 FF
400
7 FF
BFF
FFF
C00
800
00
01
10
11
CALL K
RET
RETI
RETL K
Stack 0
Stack 1
Stack 2
Stack 3
Stack 4
Stack 5
Stack 6
Stack 7
Fig. 3 Program Counter Organization
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相关代理商/技术参数 |
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|---|---|
| EM78459AK | 制造商:EMC 制造商全称:ELAN Microelectronics Corp 功能描述:8-Bit Microcontroller with MASK ROM |
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| EM78468 | 制造商:EMC 制造商全称:ELAN Microelectronics Corp 功能描述:8-BIT Microcontroller |
| EM78468AQ | 制造商:EMC 制造商全称:ELAN Microelectronics Corp 功能描述:8-BIT Microcontroller |
| EM78468BQ | 制造商:EMC 制造商全称:ELAN Microelectronics Corp 功能描述:8-BIT Microcontroller |
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