mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 222

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Sync Processor
Data Sheet
222
The frame frequency is calculated by:
Table 16-6
numbers are in hexadecimal.
VOF — Vertical Frequency Counter Overflow
$03C0
$03C1
$03C2
$06FB
$02A0
$04E2
$04E3
$04E4
$06F9
$06FA
This read-only bit is set when an overflow has occurred on the 13-bit
vertical frequency counter. Reset clears this bit, and will be updated
every vertical frame.
An overflow occurs when the period of Vsync frame exceeds
64.768ms (a vertical frame frequency lower than 15.258Hz).
VFR
1 = A vertical frequency counter overflow has occurred
0 = No vertical frequency counter overflow has occurred
Vertical Frame Frequency
Table 16-6. Sample Vertical Frame Frequencies
Max Freq.
shows examples for the Vertical Frequency Register, all VFR
186.20 Hz
130.34 Hz
130.21 Hz
130.07 Hz
100.08 Hz
100.00 Hz
99.92 Hz
70.07 Hz
70.03 Hz
69.99 Hz
Sync Processor
Min Freq.
185.70 Hz
130.07 Hz
129.94 Hz
129.80 Hz
99.92 Hz
99.84 Hz
99.76 Hz
69.99 Hz
69.95 Hz
69.91 Hz
=
=
-------------------------------------------------- -
VFR 1
------------------------------------- -
VFR 1
for internal bus clock of 6 MHz
$1FFD
$1FFE
$09C4
$09C5
$09C6
$1FFF
$0780
$0823
$0824
$0825
VFR
±
±
1
×
×
MC68HC908BD48
1
48 t
8µ
Max Freq.
15.266 Hz
15.264 Hz
15.262 Hz
Freescale Semiconductor
65.10 Hz
60.04 Hz
60.01 Hz
59.98 Hz
50.02 Hz
50.00 Hz
49.98 Hz
s
×
CYC
Min Freq.
15.262 Hz
15.260 Hz
15.258 Hz
65.00 Hz
59.98 Hz
59.95 Hz
59.92 Hz
49.98 Hz
49.96 Hz
49.94 Hz
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Rev. 2.1