參數(shù)資料
型號: M37281MFH-XXXSP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP52
封裝: 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-52
文件頁數(shù): 139/174頁
文件大小: 1420K
代理商: M37281MFH-XXXSP
Rev.1.01
2003.07.16
page 65 of 170
M37281MAH–XXXSP,M37281MFH–XXXSP,M37281MKH–XXXSP, M37281EKSP
Fig. 8.10.12 Sync Pulse Counter Register
8.10.13 Synchronous Signal Counter
The synchronous signal counter counts the composite sync signal
taken out from a video signal in the data slicer circuit or the vertical
synchronous signal Vsep as a count source.
The count value in a certain time (T time) generated by f(XIN)/213 or
f(XIN)/213 is stored into the 5-bit latch. Accordingly, the latch value
changes in the cycle of T time. When the count value exceeds “1F16,”
“1F16” is stored into the latch.
Fig. 8.10.13 Synchronous Signal Counter Block Diagram
The latch value can be obtained by reading out the sync pulse counter
register (address 00E916). A count source is selected by bit 5 of the
sync pulse counter register.
The synchronous signal counter is used when bit 0 of PWM mode
register 1 (address 020816).
Figure 8.10.12 shows the structure of the sync pulse counter and
Figure 8.10.13 shows the synchronous signal counter block diagram.
b7 b6 b5 b4 b3 b2 b1 b0
Sync pulse counter register (HC) [Address 00E916]
R W
Sync Pulse Counter Register
0
to
4
Indeterminate R —
6, 7
0
R —
Count value (HC0 to HC4)
5
0
R W
Count source (HC5)
0: HSYNC signal
1: Composite sync signal
B
After reset
Functions
Name
Nothing is assigned. These bits are write disable bits.
When these bits are read out, the values are “0.”
Reset
5-bit counter
Latch (5 bits)
f(XIN)/213
Composite
sync signal
HSYNC signal
Counter
Sync pulse
counter register
Data bus
Selection gate : connected to black
side when reset.
b5
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