Z86L79 Datasheet, PDF (50/58 Pages) Zilog, Inc. – Low-Voltage Microcontroller

Z86L79/80
Low-Voltage Microcontroller
Zilog
CTR1 (0D) 1H
D7 D6 D5 D4 D3 D2 D1 D0
Note: Care must be taken in differentiating
Transmit Mode from Demodulation Mode.
Depending on which of these two modes is
operating, the CTR1 bit will have different
functions.
Transmit Mode
R/W 0 T16_OUT is 0 Initially
1 T16_OUT is 1 Initially
Demodulation Mode
R 0 No Falling Edge Detection
R 1 Falling Edge Detection
W 0 No Effect
W 1 Reset Flag to 0
Transmit Mode*
R/W 0 T8_OUT is 0 Initially
1 T8_OUT is 1 Initially
Demodulation Mode
R 0 No Rising Edge Detection
R 1 Rising Edge Detection
W 0 No Effect
W 1 Reset Flag to 0
Transmit Mode
0 0 Normal Operation
0 1 Ping-Pong Mode
1 0 T16_OUT = 0
1 1 T16_OUT = 1
Demodulation Mode
0 0 No Filter
0 1 4 SCLK Cycle Filter
1 0 8 SCLK Cycle Filter
1 1 16 SCLK Cycle Filter
Transmit Mode/T8/T16 Logic
0 0 AND
0 1 OR
1 0 NOR
1 1 NAND
Demodulation Mode
0 0 Falling Edge Detection
0 1 Rising Edge Detection
1 0 Both Edge Detection
1 1 Reserved
Transmit Mode
0 P36 as Port Output*
1 P36 as T8/T16_OUT
Demodulation Mode
0 P31 as Demodulator Input
1 P20 as Demodulator Input
Transmit/Demodulation Modes
0 Transmit Mode*
1 Demodulation Mode
Note: Changing from one mode to
another cannot be done without
disabling the counter/timers.
*Default setting after reset.
Figure 41. T8 and T16 Common Control Functions
((0D) 1H: Read/Write)
3-50
PRELIMINARY