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EF6805P2 bảng dữ liệu(PDF) 10 Page - STMicroelectronics

tên linh kiện EF6805P2
Giải thích chi tiết về linh kiện  8-BIT MICROCOMPUTER UNIT
PDF  31 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

EF6805P2 bảng dữ liệu(HTML) 10 Page - STMicroelectronics

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The A and X registers and all RAM locations except
$07F and $07E are modified.
ROM CHECKSUM SUBROUTINE - The ROM self-
check is called at location $F95. The A register
should be cleared before calling the routine. If any
error is detected, it returns with the Z bit cleared ;
otherwise Z = 1, X = 0 on return, and A is zero if the
test passes. RAM location $040 to $043 is overwrit-
ten. The checksum is the complement of the execu-
tion OR of the contents of the user ROM.
* This connection depends on clock oscillator user selectable
mask option. Use jumper if the RC mask option is selected.
Figure 11 : Self-check Connections.
LED MEANINGS
PC0 PC1 PC2 PC3
Remarks
(1 : LED ON ; 0 : LED OFF)
1
0
1
0
0
0
0
1
1
0
1
1
0
0
0
0
0
0
0
0
Bad I/O
Bad Timer
Bad RAM
Bad ROM
Bad Interrupts or Request Flag
All Flashing
Good Device
EF6805U3
10/31



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