MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 200

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12.4 Operation of Hi-Z Output Controller
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(3) To resume output when a pin is in high-impedance state
(4) To make pin go into a high-impedance state by using software
(1) To set high-impedance control operation
(2) To change setting after enabling high-impedance control
When the HZA0DCM0 bit is 1, the HZA0DCC0 bit is set to 1 to cancel the high-impedance state after the valid
edge of the TW0TOFFP pin is detected, but the high-impedance state will not be canceled unless the bit is set
while the input level of the TW0TOFFP pin is inactive.
To make a pin go into a high-impedance state by setting the HZA0DCT0 bit to 1 via software, the bit must be
set while the input level of the TW0TOFFP pin is inactive.
independent of the setting of the HZA0DCM0 bit is given below.
If the TW0TOFFP pin input is not used when the HZA0DCP0 bit = 0 and HZA0DCN0 bit = 0, the target pin
goes into a high-impedance when the HZA0DCT0 bit is set to 1.
<Procedure>
<1> Set the HZA0DCM0, HZA0DCN0, and HZA0DCP0 bits.
<2> Set the HZA0DCE0 bit to 1 (to enable high-impedance control).
<Procedure>
<1> Clear the HZA0DCE0 bit to 0 (to disable the high-impedance control operation).
<2> Change the setting of the HZA0DCM0, HZA0DCN0, and HZA0DCP0 bits.
<3> Set the HZA0DCE0 bit to 1 (to enable high-impedance control again).
<Procedure>
<1> Set the HZA0DCC0 bit to 1 (signal to cancel the high-impedance state).
<2> Read the HZA0DCF0 bit to check the status of the flag.
<3> Return to <1> if the HZA0DCF0 bit = 1. The input level of the TW0TOFFP pin must be checked. If
<Procedure>
<1> Set the HZA0DCT0 bit to 1 (high-impedance output instruction).
<2> Read the HZA0DCF0 bit to check the status of the flag.
<3> Return to <1> if the HZA0DCF0 bit is 0. The input level of the TW0TOFFP pin must be checked.
the HZA0DCF0 bit = 0, the pin can output its signal.
The pin is in the high-impedance state if the HZA0DCF0 bit = 1.
CHAPTER 12 Hi-Z OUTPUT CONTROLLER
User’s Manual U17890EJ2V0UD
An example of a setting procedure that is