MC68HC908LD60IFU Freescale Semiconductor, MC68HC908LD60IFU Datasheet - Page 216

• Manufacturer Part Number: MC68HC908LD60IFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908LD60IFU

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 6MHz
• Program Memory Type: Flash
• Program Memory Size: 60KB
• Total Internal Ram Size: 1KB
• # I/os (max): 39
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• On-chip Adc: 6-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Compliant

Sync Processor
16.5.1 Polarity Detection
16.5.1.1 Hsync Polarity Detection
16.5.1.2 Vsync Polarity Detection
16.5.1.3 Composite Sync Polarity Detection
Technical Data
216
The Hsync polarity detection circuit measures the length of high and low
period of the HSYNC input. If the length of high is longer than L and the
length of low is shorter than S, the HPOL bit will be "0", indicating a
negative polarity HSYNC input. If the length of low is longer than L and
the length of high is shorter than S, the HPOL bit will be "1", indicating a
positive polarity HSYNC input. The table below shows three possible
cases for HSYNC polarity detection — the conditions are selected by the
HPS[1:0] bits in the Sync Processor Control Register 1 (SPCR1).
The Vsync polarity detection circuit performs a similar function as for
Hsync. If the length of high is longer than 4ms and the length of low is
shorter than 2ms, the VPOL bit will be "0", indicating a negative polarity
VSYNC input. If the length of low is longer than 4ms and the length of
high is shorter than 2ms, the VPOL bit will be "1", indicating a positive
polarity VSYNC input.
When a composite sync signal is the input (COMP = 1 for composite
sync processing), the HPOL bit = VPOL bit, and the polarity is detected
using the VSYNC polarity detection criteria described in section
16.5.1.2.
Long is greater than (L)
3.5µs
14µs
Polarity Detection Pulse Width
7µs
Sync Processor
Short is less than (S)
12µs
6µs
3µs
MC68HC908LD60
Freescale Semiconductor
HPS1
SPCR1 ($0046)
0
1
0
—
HPS0
Rev. 1.1
0
X
1