PCA84C646P PHILIPS [NXP Semiconductors], PCA84C646P Datasheet - Page 58

• Manufacturer Part Number: PCA84C646P
• Description: Microcontrollers for TV tuning control and OSD applications
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
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 s.
1995 Jun 15
Microcontrollers for TV tuning
control and OSD applications
Power-on-reset
READ D24
T3
Fig.46 T3: 8-bit counter block diagram.
RESET
CK
58
16 I
The I
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
data and SCL = clock line. Both pins are only available in
port option 2 (see Fig.48).
8-BIT COUNTER
READ ENABLE
2
2
C-BUS MASTER SLAVE TRANSCEIVER
C-bus master and slave transceiver is integrated. In
PCA84C646; PCA84C846
Q0 to Q7
Data bus
MLC075
Preliminary specification
2
C-bus