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PDF EM78P459 Data sheet ( Hoja de datos )
| Número de pieza | EM78P459 | |
| Descripción | 8-BIT MICRO-CONTROLLER | |
| Fabricantes | ELAN Microelectronics Corp | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de EM78P459 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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EM78P458/459
OTP ROM
EM78P458/459
8-BIT MICRO-CONTROLLER
Version 1.4
1 page  
* 20 pin DIP 300mil
: EM78P458AP
* 20 pin SOP 300mil
: EM78P458AM
* 24 pin skinny DIP 300mil : EM78P459AK
* 24 pin SOP 300mil
: EM78P459AM
EM78P458/459
OTP ROM
This specification is subject to change without prior notice.
5
06.25.2004 (V1.4)
5 Page 
EM78P458/459
OTP ROM
4. R3 (Status Register)
76543210
CMPOUT PS1
PS0
T
P
Z DC C
• Bit 7 (CMPOUT) the result of the comparator output.
• Bit 6 (PS1) ~ 5 (PS0) Page select bits. PS0~PS1 are used to select a program memory page. When
executing a "JMP", "CALL", or other instructions which cause 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 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 the place where the
subroutine was called, regardless of the current setting of PS0~PS1 bits.
PS1 PS0
00
01
10
11
Program memory page [Address]
Page 0 [000-3FF]
Page 1 [400-7FF]
Page 2 [800-BFF]
Page 3 [C00-FFF]
• Bit 4 (T) Time-out bit. Set to 1 by the "SLEP" and "WDTC" commands, or during Power on and reset
to 0 by WDT time-out.
• 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 2 (Z) Zero flag. Set to "1" if the result of an arithmetic or logic operation is zero.
• Bit 1 (DC) Auxiliary carry flag
• Bit 0 (C) Carry flag
5. R4 (RAM Select Register)
• Bit 7 is a general-purpose read/write bit.
• Bit 6 is used to select bank 0 or bank 1.
• Bits 0~5 are used to select registers (address: 00~3F) in the indirect address mode.
6. R5 ~ R6 (Port 5 ~ Port 6)
• R5 and R6 are I/O registers.
7. R7 ~ R8
• All of these are 8-bit general-purpose registers.
8. R9 (ADCON: Analog to Digital Control)
76543
-
-
IOCS
ADRUN ADPD
• Bit 7:Bit 6 Unemployed, read as ‘0’;
• Bit 5(IOCS): Select the Segment of IO control register.
2
ADIS2
1
ADIS1
0
ADIS0
This specification is subject to change without prior notice.
11
06.25.2004 (V1.4)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet EM78P459.PDF ] | |
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