參數(shù)資料
型號(hào)： HMS91C7432
廠商： HYNIX SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： HMS91C7432 features and functions
中文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PDIP20
封裝： PLASTIC, DIP-20
文件頁(yè)數(shù)： 69/90頁(yè)
文件大?。?/td> 1557K
代理商： HMS91C7432
HMS9xC7132 / HMS9xC7134
May.2001 ver1.1
65
19.7 Horizontal sync. generator
This block generates horizontal sync pulses with positive polari-
ty.This can be done in 3 modes, selectable with HPG. When HPG
is 00, the generator operates in the free running mode and the gen-
erated pulse repetition period equals HF x 1/12 MHz clock peri-
od, where HF is a 10 bit value. As a result the frequency of the
free running output sync pulse equals 12 x 106 / HF, with about
12 kHz as lower boundary.When HPG is 01, the input sync pulse
is followed and a substitution pulse is inserted. In case HPG
equals 11, the inputsync pulse is followed but a substitution pulse
is disabled, while the incoming sync is missing.
Table 19-4 Modes of the horizontal pulse generator
Table 19-5 Free running horizontal sync pulse width
Example Program; Freerun mode
HPG[1:0]
Selected mode
0 0
Free running mode
Period time of horizontal pulse generator (= HF)
0 1
The same pulse as the input horizontal sync
Substitution pulse insertion in case of a missing sync pulse
1 0
Reserved
1 1
The same pulse as the input horizontal sync
No substitution pulse insertion in case of a missing sync pulse
HOPW[4:0]
Selected mode
00000
2 x 83 ns
00001
3 x 83 ns
00010
4 x 83 ns
-------
Incremented by 83ns (1/12 x 10
-6
)
11101
31 x 83 ns
11110
32 x 83 ns
11111
33 x 83 ns
;================================================================
;
Free running
;================================================================
SetFreeRunning:
lcall
SetVcp
SetFreeRunning1:
mov
A, #01000100b
mov
MDCON, A
mov
HFH,#00101110b
mov
HFL,#01010000b
mov
VFH,#01000010b
mov
VFL,#11001000b
mov
CPGEN,#11100000b
mov
A, #01000000b
mov
HVGEN, A
lcall
DpmsHLinearity
ret
; rising Edge Interrupt
;
; Hf = 64.6 kHz
; HOPW[10000]
; Vf = 60 Hz
; VOPW[1000]
; White Picture Clamping and Pattern
; Negative Hsync, Positive Vsync free-run
;
;
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