UPD780076GC-XXX-AB8 查看數據表（PDF） - NEC => Renesas Technology

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产品描述 (功能)

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UPD780076GC-XXX-AB8

8-bit Single-chip Microcontroller

NEC => Renesas Technology 

(3) SPD chart

KEYIN

CHAPTER 13 APPLICATIONS OF KEY INPUT

Outputs key scan signal to P34-P37

UNTIL: key scan signal output ends

Key return signal input from P4

IF: key input changes

THEN

Sets status in which key input changes

CHTFG

Shifts key scan signal 1 bit

IF: no key input change

THEN

IF: chattering being absorbed

THEN

IF: chattering ends

THEN

IF: valid key changes

THEN

Sets key change status

Sets KEYCHG

Updates key data

ELSE

Sets chattering absorption start status

Clears CHTEND

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