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MB90552A Datasheet(PDF) 7 Page - Fujitsu Component Limited. |
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MB90552A Datasheet(HTML) 7 Page - Fujitsu Component Limited. |
7 / 58 page MB90550A/550B Series 7 s s s s PIN DESCRIPTION (Continued) Pin no. Pin name Circuit type Function QFP LQFP 82 80 X0 A Oscillation pin 83 81 X1 A Oscillation pin 77 75 RST B Reset input pin 52 50 HST C Hardware standby input pin 85 to 92 83 to 90 P00 to P07 D (CMOS) General-purpose I/O ports. A pull-up resistor can be added (RD07 to RD00 = 1) by using the pull-up resistor setting register (RDR0). D07 to D00 = 1: Disabled when the port is set for output. AD00 to AD07 Serve as lower data I/O/lower address output (AD00 to AD07) pins in the external bus mode. 93 to 100 91 to 98 P10 to P17 D (CMOS) General-purpose I/O ports. A pull-up resistor can be added (RD17 to RD10 = 1) by using the pull-up resistor setting register (RDR1). D17 to D10 = 1: Disabled when the port is set for output. AD08 to AD15 Serve as upper data I/O/middle address output (AD08 to AD15) pins in the 16-bit bus-width, external bus mode. 1 to 8 99,100, 1 to 6 P20 to P27 E (CMOS) General-purpose I/O ports. This function is enabled either in single-chip mode or with the external address output control register set to “Port”. A16 to A23 External address bus A16 to A23 output pins. This function is enabled in an external-bus enabled mode with the external address output register set to “Address”. 97 P30 E (CMOS) General-purpose I/O port. This function is enabled in single-chip mode. ALE Address latch enable output pin. This function is enabled in an external-bus enabled mode. 10 8 P31 E (CMOS) General-purpose I/O port. This function is enabled in single-chip mode. RD Read strobe output pin for the data bus. This function is enabled in an external-bus enabled mode. 12 10 P32 E (CMOS) General-purpose I/O port. This function is enabled in single-chip mode. WRL Write strobe output pin for the lower eight bits of the data bus. This function is enabled in an external-bus enabled mode. 13 11 P33 E (CMOS) General-purpose I/O port. This function is enabled in single-chip mode. WRH Write strobe output pin for the upper eight bits of the data bus. This function is enabled in an external-bus enabled mode. |
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