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UPD72001GC-11-3B6 Datasheet(PDF) 7 Page - NEC |
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UPD72001GC-11-3B6 Datasheet(HTML) 7 Page - NEC |
7 / 40 page µPD72001-11, 72001-A8 7 1. PIN FUNCTIONS The functions of the MPSC can be broadly classified into “system interface functions” that control interfacing with the host system, and “transmission/reception functions” to transmit or receive data. This section explains the functions of the pins of the MPSC by classifying the pins into those related to system interfacing and those related to transmission and reception. Hereafter, “H” (voltage level satisfying VIH in the case of an input pin, or voltage level satisfying VOH in the case of an output pin) and “L” (voltage level satisfying VIL in the case of an input pin, or voltage level satisfying VOL in the case of an output pin) are used to indicate the input/output status of a pin. 1.1 Pins Related to System Interface (1) VDD Supply voltage pin (2) GND GND pin (3) RESET ... Input This pin inputs a signal from an external device to reset the MPSC. When “L” is input to this pin for the duration of 2 clock cycles (2tCYK) or longer, the MPSC is reset (this is called system reset). As a result of system reset, the transmitter, receiver, and interrupt/DMA functions of the MPSC are disabled, and the TXD pin and general-purpose output pins go high. In this case, because all bits of the control register (CR) are also reset, CR must be set again if a system reset has been executed. Table 1-1 shows the status of each pin at system reset, in comparison with the pin status at channel reset (CR0: D5, D4, D3 = “0, 1, 1”). The MPSC automatically enters the standby mode at system reset, lowering the power consumption from that in the normal operation mode. |
Similar Part No. - UPD72001GC-11-3B6 |
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