Preliminary W78E378/W78C378/W78C374
2. Pulse width selectable.
For Fosc = 10 MHz:
HCWS = 0
HCWS = 1
Pulse Width
-
-
500 600 nS
900 1000 nS
Safe Operation Area (SOA) Interrupt
´
Upper boundary frequency = FOSC/ [8 SOARH]
Lower boundary frequency = FOSC/ [8 ´ (SOARL + 1)]
Function description:
·
If the condition, HFREQ lower than the lower boundary freq. or higher than the upper boundary freq.,
happens twice continuously, the SOAINT will be activated.
·
If the HIN is stopped for a certain period, the SOAINT will also be generated.
The no Hsync response time is 512/FOSC. (e.x., 51.2us for 10 MHz)
·
If SOAHDIS = 1, then no upper boundary frequency.
Half Hsync Output
When ENHFO (bit 0 of CTRL3) is set, P4.7 (HFO) will output the same or half frequency from P4.0
(HFI). The divide-by-two operation is done at the falling edge of HFI signal when HFO_HALF (bit 3 of
CTRL3) is set. The polarity of HFO is specified by HF_POL (bit 2 of CTRL3).
HFI
HFO
(HFO_HALF=0)
(HF_POL=1)
HFO
(HFO_HALF=0)
(HF_POL=0)
HFO
(HFO_HALF=1)
Publication Release Date: December 1999
- 29 -
Revision A1
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