Z86L71 datasheet(52/61 Pages) ZILOG

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Z86L70/71/75/C71

IR/Low-Voltage Microcontroller

Zilog

1-52

P R E L I M I N A R Y

DS97LVO0500

Figure 41. T8 and T16 Common Control Functions

((0D) 1H: Read/Write)

CTR1 (0D) 1H

0 T16_OUT is 0 Initially

1 T16_OUT is 1 Initially

R/W

0 No Falling Edge Detection

1 Falling Edge Detection

0 No Effect

1 Reset Flag to 0

0 T8_OUT is 0 Initially

1 T8_OUT is 1 Initially

0 No Rising Edge Detection

1 Rising Edge Detection

0 0 Normal Operation

0 1 Ping-Pong Mode

1 0 T16_OUT = 0

1 1 T16_OUT = 1

Transmit Mode/T8/T16 Logic

0 0 Falling Edge Detection

0 1 Rising Edge Detection

1 0 Both Edge Detection

1 1 Reserved

0 P36 as Port Output *

1 P36 as T8/T16_OUT

0 Transmit Mode *

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

Demodulation Mode

Transmit Mode

R/W

Demodulation Mode

Transmit Mode

Demodulation Mode

0 0 AND

0 1 OR

1 0 NOR

1 1 NAND

Demodulation Mode

Transmit Mode

0 P31 as Demodulator Input

1 P20 as Demodulator Input

Demodulation Mode

Transmit/Demodulation Modes

0 No Effect

1 Reset Flag to 0

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.

*Note: Changing from one mode to

another cannot be done without

disabling the counter/timers.

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