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HD64F2149YV 数据表(PDF) 280 Page - Renesas Technology Corp |
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HD64F2149YV 数据表(HTML) 280 Page - Renesas Technology Corp |
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280 / 1075 page  Section 8 I/O Ports Rev. 3.00 Jan 18, 2006 page 252 of 1044 REJ09B0280-0300 8.11.3 Pin Functions Port A pins also function as keyboard buffer controller I/O pins (PS2AC, PS2AD, PS2BC, PS2BD, PS2CC, PS2CD), key-sense interrupt input pins ( KIN15 to KIN8), expansion A/D converter input pins (CIN15 to CIN8), and address output pins (A23 to A16). The port A pin functions are shown in table 8.21. Table 8.21 Port A Pin Functions Pin Selection Method and Pin Functions PA7/A23/PS2CD/ KIN15/CIN15 The pin function is switched as shown below according to the combination of operating mode, the KBIOE bit in KBCR2H of the keyboard buffer controller, the IOSE bit in SYSCR, and bit PA7DDR. Operating mode Modes 1, 2 (EXPE = 0), 3 Mode 2 (EXPE = 1) KBIOE 0 1 0 1 PA7DDR 0 1 — 01 — IOSE —— —— 01 — Pin function PA7 input pin PA7 output pin PS2CD output pin PA7 input pin A23 output pin PA7 output pin PS2CD output pin KIN15 input pin, CIN15 input pin, PS2CD input pin When the IICS bit in STCR is set to 1, this pin functions as a bus buffer. This pin can always be used as the PS2CD, KIN15, or CIN15 input pin. |
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