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UPD70F3208 Datasheet(PDF) 71 Page - NEC |
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UPD70F3208 Datasheet(HTML) 71 Page - NEC |
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71 / 757 page  CHAPTER 2 PIN FUNCTIONS User’s Manual U15862EJ3V0UD 71 (iv) HLDRQ (hold request) ... Input This is the input pin by which an external device requests the V850ES/KF1 to release the external address/data bus and strobe pins. This pin supports asynchronous input for CLKOUT. When this pin is active, the external address/data bus and strobe pins are set to high impedance either when the V850ES/KF1 completes execution of the current bus cycle, or immediately if no bus cycle is being executed. The HLDAK signal is then made active and the bus is released. To ensure that the bus hold state is entered, keep the HLDRQ signal active until the HLDAK signal is output. (9) PCS0, PCS1 (port CS) ... I/O Port CS is a 2-bit I/O port for which input and output can be set in 1-bit units. In addition to functioning as a port, PCS0 and PCS1 can also be used for chip select signal output when the memory is expanded externally in the control mode. The port mode and control mode can be selected as the operation mode for each bit, and are specified by the port CS mode control register (PMCCS). (a) Port mode PCS0 and PCS1 can be set to input or output in 1-bit units by the port CS mode register (PMCS). (b) Control mode PCS0 and PCS1 can be set to the port mode or control mode in 1-bit units by the PMCCS register. (i) CS0, CS1 (chip select) ... Output These are the chip select signals for external memory and external peripheral I/Os. Signal CSn is allocated to memory block n (n = 0, 1). These pins become active when a bus cycle for accessing the corresponding memory block is started. In the idle state (TI), these pins are inactive. (10) PCT0, PCT1, PCT4, PCT6 (port CT) ... I/O Port CT is a 4-bit I/O port for which input and output can be set in 1-bit units. In addition to functioning as a port, PCT0, PCT1, PCT4, and PCT6 can also be used for control signal output when the memory is expanded externally in the control mode. The port mode and control mode can be selected as the operation mode for each bit, and are specified by the port CT mode control register (PMCCT). (a) Port mode PCT0, PCT1, PCT4, and PCT6 can be set to input or output in 1-bit units by the port CT mode register (PMCT). (b) Control mode PCT0, PCT1, PCT4, and PCT6 can be set to the port mode or control mode in 1-bit units by the PMCCT register. (i) WR0 (lower byte write strobe) ... Output This is the write strobe signal output pin for the lower data of the external 16-bit data bus. |
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