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EPVP6200 Datasheet(PDF) 28 Page - ELAN Microelectronics Corp

Part No. EPVP6200
Description  VFD Controller
Download  57 Pages
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Maker  EMC [ELAN Microelectronics Corp]
Homepage  http://www.emc.com.tw
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 28 page
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ePVP6200
VFD Controller
22 of 57
11.18.2004 (V1.53)
This specification is subject to change without further notice.
Bit 3 (PAB)
:
Prescaler assignment bit
0/1
TCC/WDT
When in WDT mode (Bit 3 = 1), the prescaler is cleared by the WDTC and
SLEP instructions. Likewise, when in TCC mode (Bit 3 = 0), the prescaler
will can NOT be cleared by SLEP instructions.
An 8-bit counter is provided as prescaler for the TCC or WDT. The
prescaler is available for the TCC only or for the WDT only at a given time.
An 8 bit counter is made available for TCC or WDT as determined by the
status of Bit 3 (PAB) of the CONT register.
Both TCC and prescaler are cleared each time a write to TCC instruction is
executed. (See the table above for the prescaler ratio under CONT register
and Fig.7 below for the TCC/WDT block diagram.)
Bit 4 (RETBK)
:
Return value backup control for interrupt routine
0/1
disable/enable
When this bit is set to 1, the CPU will store ACC, R3 status, and R5 PAGE 1
automatically after an interrupt is triggered. It will be restored after
instruction RETI. When this bit is set to 0, you need to store ACC, R3, and
R5 PAGE 1 in you program.
Bit 5 (TS)
:
TCC signal source
0
internal instruction cycle clock
timing = ( 2 / system clock) * prescaler* (256 – count vaule)
1
16.384kHz
timing = ( 1 /16.384k) * prescaler * (256 – count vaule)
Bit 6 (INT)
:
INT enable flag
0
interrupt masked by DISI or hardware interrupt
1
interrupt enabled by ENI/RETI instructions
Bit 7 (P90EG) : Interrupt edge type of P90
0
P90 interruption source is a rising edge signal.
1
P90 interruption source is a falling edge signal.
16.38KHz
Fig. 7 TCC & WDT Block Diagram




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