参数资料
型号: M37161MF-XXXSP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42
封装: 0.600 INCH, 1.78 MM PITCH, PLASTIC, SDIP-42
文件页数: 82/129页
文件大小: 1092K
代理商: M37161MF-XXXSP
Rev.1.00
2003.11.25
page 56 of 128
M37161M8/MA/MF-XXXSP/FP,M37161EFSP/FP
The vertical display start position is determined by counting the hori-
zontal sync signal (HSYNC). At this time, when VSYNC and HSYNC are
positive polarity (negative polarity), the count starts at the rising edge
(falling edge) of HSYNC signal after the fixed cycle of the rising edge
(falling edge) of VSYNC signal. So the interval from the rising edge
(falling edge) of VSYNC signal to the rising edge (falling edge) of HSYNC
signal needs enough time (2 machine cycles or more) to avoid jitter.
The polarity of HSYNC and VSYNC signals can select with the I/O po-
larity control register (address 00D816).
Fig. 8.10.7 Supplement Explanation for Display Position
When bits 0 and 1 of the I/O polarity control register
(address 00D816) are set to “1” (negative polarity)
VSYNC signal input
VSYNC control
signal in
microcomputer
0.25 to 0.50 [
s]
( at f(XIN) = 8MHz)
Period of counting
HSYNC signal
(See note 2)
HSYNC
signal input
Not count
12345
Notes 1 : The vertical position is determined by counting falling edge of HSYNC
signal after rising edge of VSYNC control signal in the microcomputer.
2 : Do not generate falling edge of HSYNC signal near rising edge of
VSYNC control signal in microcomputer to avoid jitter.
3 : The pulse width of VSYNC and HSYNC needs 8 machine cycles or
more.
8 machine cycles
or more
8 machine cycles
or more
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