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MB90F443G Datasheet(PDF) 7 Page - Fujitsu Component Limited. |
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MB90F443G Datasheet(HTML) 7 Page - Fujitsu Component Limited. |
7 / 64 page MB90440G Series DS07-13716-3E 7 ■ PIN DESCRIPTION (Continued) Pin No. Pin name Circuit type Function 82 83 X0 X1 A (Oscillation) High speed oscillator input pins 80 79 X0A X1A A (Oscillation) Low speed oscillator input pins 77 RST B External reset request input 52 N.C. ⎯ not connected 85 to 92 P00 to P07 H General I/O port with programmable pullup. This function is en- abled in the single-chip mode. AD00 to AD07 I/O pins for 8 lower bits of the external address/data bus. This func- tion is enabled when the external bus is enabled. 93 to 100 P10 to P17 H General I/O port with programmable pullup. This function is en- abled in the single-chip mode. AD08 to AD15 I/O pins for 8 higher bits of the external address/data bus. This func- tion is enabled when the external bus is enabled. 1 to 8 P20 to P27 H General I/O port with programmable pullup. This function is en- abled in the single-chip mode. A16 to A23 I/O pins of 8 bits for A16 to A23 ot the external address bus. This function is enabled when the external bus is enabled. 9 P30 H General I/O port with programmable pullup. This function is en- abled in the single-chip mode. ALE Address latch enable output pin. This function is enabled when the external bus is enabled. 10 P31 H General I/O port with programmable pullup. This function is en- abled in the single-chip mode. RD Read strobe output pin for the data bus. This function is enabled when the external bus is enabled. 12 P32 H General I/O port with programmable pullup. This function is en- abled in the single-chip mode or when the WR/WRL pin output is disabled. WRL Write strobe output pin for the data bus. This function is enabled when the external bus is in enable mode and the WR/WRL pin out- put is enabled. WRL is used as a write-strobe output pin for 8 lower bits of the data bus in 16-bit access while WR is used as a write- strobe output pin for 8 bits of the data bus in 8-bit access. WR 13 P33 H General I/O port with programmable pullup. This function is en- abled in the single-chip mode or external bus 8-bit mode or when WRH pin output is disabled. WRH Write strobe output pin for the 8 higher bits of the data bus. This function is enabled when the external bus is enabled, when the ex- ternal bus 16-bit mode is selected, and when the WRH output pin is enabled. |
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