Panasonic KX-FT21BX Service Manual page 91

I/O and Pin No. Diagram
3 RAMCS 6 XRAMCS
XRESET 17
106~107
110~112
94~105
XWR 115
XRD 113
XROMCS 112
104~111
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KX-FT21LA
RESET
2 A12~A16
RA1
RA2
2 A0~A11
RA3
R9
3 WR
R10
3 RD
R12
3 ROMCS
RA4
1 D0~D7
RA5