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EPVP6200 Datasheet(PDF) 37 Page - ELAN Microelectronics Corp

Part No. EPVP6200
Description  VFD Controller
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Maker  EMC [ELAN Microelectronics Corp]
Homepage  http://www.emc.com.tw
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 37 page
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ePVP6200
VFD Controller
This specification is subject to change without further notice.
11.18.2004 (V1.53) 31 of 57
7.7.4 Wake-up from IDLE Mode
1. WDT time out
2. External interrupt
3. Internal interrupt like counters
All these cases requires you to enable the circuit before entering IDLE mode. All the registers
values are preserved when "SLEP" instruction is executed and restored after wake-up.
During execution of case 2 or 3, controller will wake up and jump to address 0x08 for
interruption sub-routine. After performing the sub-routine ("RETI" instruction), the program
will jump to the next instruction following the "SLEP" instruction.
7.8 Interrupts
RD, RE, and RF are the interrupt status registers which record the interrupt request in flag bit.
IOCD, IOCE, & IOCF are their interrupt mask registers respectively. Global interrupt is
enabled by ENI instruction and is disabled by DISI instruction. When one of the interrupts
(when enabled) is generated, it will cause the next instruction to be fetched from address
008H. Once in the interrupt service routine, the source of the interrupt can be determined by
polling the flag bits in their respective (RD, RE, and RF) registers.
The interrupt flag bit must be cleared in the software before leaving the interrupt service
routine and enabling interrupts to avoid recursive interrupts.
7.9 Instruction Set
The Instruction set has the following features:
1. Every bit of any register can be set, cleared, or tested directly.
2. The I/O register can be treated as a general register. That is, the same instruction can
operates on I/O register.
The symbol "R" represents a register designator which specifies which one of the 64 registers
(including operational registers and general purpose registers) is to be utilized by the
instruction. Bits 6 and 7 in R4 determine the selected register bank. "b'' represents a bit field
designator which selects the number of the bit located in the Register "R,” and affected by the
operation. "k'' represents an 8 or 10-bit constant or literal value.




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