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SAB-C504-LM Datasheet(PDF) 8 Page - Siemens Semiconductor Group |
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SAB-C504-LM Datasheet(HTML) 8 Page - Siemens Semiconductor Group |
8 / 49 page C504 Semiconductor Group 8 P3.0-P3.7 5, 7-13 5 7 8 9 10 11 12 13 I/O Port 3 is an 8-bit bidirectional port. P3.0 (R ×D) and P3.1 (T×D) operate as defined for the C501. P3.2 to P3.7 contain the external interrupt inputs, timer inputs, input and as an additional optinal function four of the analog inputs of the A/D-converter. Port 3 pins are assigned to be used as analog inputs via the bits of SFR P3ANA. P3.6/WR can be assigned as a third interrupt input. The functions are assigned to the pins of port 3 as follows: P3.0 / RxD Receiver data input (asynch.) or data input/output (synch.) of serial interface P3.1 / TxD Transmitter data output (asynch.) or clock output (synch.) of serial interface P3.2 / AN4 / INT0 Analog input channel 4 / external interrupt 0 input / timer 0 gate control input P3.3 / AN5 / INT1 Analog input channel 5 / external interrupt 1 input / timer 1 gate control input P3.4 / AN6 / T0 Analog input channel 6 / timer 0 counter input P3.5 / AN7 / T1 Analog input channel 7 / timer 1 counter input P3.6 / WR / INT2 WR control output; latches the data byte from port 0 into the external data memory / external interrupt 2 input P3.7 / RD RD control output; enables the external data memory CTRAP 6 I CCU Trap Input With CTRAP = low the compare outputs of the CAPCOM unit are switched to the logic level as defined in the COINI register (if they are enabled by the bits in SFR TRCON). CTRAP is an input pin with an internal pullup resistor. For power saving reasons, the signal source which drives the CTRAP input should be at high or floating level during power-down mode. *) I = Input O = Output Table 1 Pin Definitions and Functions (cont’d) Symbol Pin Number (P-MQFP-44) I/O *) Function |
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