參數(shù)資料
型號(hào)： EM78P451
英文描述： Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Protection Features; Temperature Range: 0&degC to 70°C; Package: 16-QFN
中文描述： 8位微控制器的通用產(chǎn)品[英文]
文件頁(yè)數(shù)： 51/52頁(yè)
文件大?。?/td> 1287K
代理商： EM78P451
EM78P451
OTP ROM
This specification is subject to change without prior notice.
2002/03/01
8
4. R3 (Status Register)
7
6
5
4
3
2
1
0
GP
PS1
PS0
T
P
Z
DC
C
Bit 0 (C) Carry flag
Bit 1 (DC) Auxiliary carry flag
Bit 2 (Z) Zero flag. Set to "1" if the result of an arithmetic or logic operation is zero.
Bit 3 (P) Power down bit. Set to 1 during power on or by a "WDTC" command and reset to 0 by a
"SLEP" command.
Bit 4 (T) Time-out bit. Set to 1 with the "SLEP" and the "WDTC" commands, or during power up and
reset to 0 with WDT timeout.
Bits 5 (PS0) ~ 6 (PS1) Page select bits. PS0~PS1 are used to pre-select a program memory page.
When executing a "JMP", "CALL", or other instructions which causes the program counter to be
changed (e.g. MOV R2, A), PS0~PS1 are loaded into the 11th and 12th bits of the program counter
where it selects selecting one of the available program memory pages. Note that RET (RETL, RETI)
instruction does not change the PS0~PS1 bits. That is, the return will always be to the page from
where the subroutine was called, regardless of the current setting of PS0~PS1 bits. PS1 bit is not
used (read as "0") and cannot be modified in EM78P451.
PS1
PS0
Program memory page [Address]
0
Page 0 [000-3FF]
0
1
Page 1 [400-7FF]
1
0
Page 2 [800-BFF]
1
Page 3 [C00-FFF]
Bit 7 (GP) General read/write bit.
5. R4 (RAM Select Register)
Bits 0~5 are used to select the registers (address: 00~3F) in the indirect addressing mode.
Bits 6~7 determine which bank is activated among the 4 banks.
If no indirect addressing is used, the RSR is used as an 8-bit general-purposed read/writer register.
See the configuration of the data memory in Fig. 4.
6. R5~R8 (Port 5 ~ Port8)
Four general 8 bits I/O registers
Both P74 and P76 read or write data from the DATA pin, while both P75 and P77 read or write data
from the CLK pin.
7. R9 (Port9)
A general 6-bit I/O register. The values of the two most significant bits are read as "0".
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