參數(shù)資料
型號: PCA84C646
廠商: NXP Semiconductors N.V.
英文描述: Microcontrollers for TV tuning control and OSD applications(應(yīng)用于TV調(diào)頻和OSD的微控制器)
中文描述: 微控制器的控制和調(diào)整(應(yīng)用于電視調(diào)頻和OSD的微控制器應(yīng)用的電視OSD)
文件頁數(shù): 58/72頁
文件大?。?/td> 564K
代理商: PCA84C646
1995 Jun 15
58
Philips Semiconductors
Preliminary specification
Microcontrollers for TV tuning
control and OSD applications
PCA84C646; PCA84C846
15 T3: 8-BIT COUNTER
Figure 46 shows the block diagram of the 8-bit counter. A
Schmitt-trigger input pin shapes the slow slope of the input
signal into a square wave. The rising edge of the signal
increases the (ripple) counter by 1.
The data in the counter can be read by instruction
‘MOV A, D24H’ (Derivative Register 24). As soon as data
is read, this counter is reset to
zero
. Overflow or
Power-on-reset both reset the counter value to
zero
.
Minimum distance between two successive pulses
(rising edges) is 30
μ
s.
16 I
2
C-BUS MASTER SLAVE TRANSCEIVER
The I
2
C-bus master and slave transceiver is integrated. In
control register CON1 (Derivative Register 22) bits SCLE
and SDAE select the function of pins DP20/SDA and
DP21/SCL (for selection see Table 23); SDA = I
2
C-bus
data and SCL = clock line. Both pins are only available in
port option 2 (see Fig.48).
Fig.46 T3: 8-bit counter block diagram.
handbook, full pagewidth
MLC075
T3
Power-on-reset
READ D24
8-BIT COUNTER
READ ENABLE
RESET
Q0 to Q7
CK
Data bus
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