M32C83T datasheet(390/527 Pages) RENESAS

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Page 367

24. Programmable I/O Port

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24.5 Function Select Register C (PSC Register)

Figure 24.14 show the PSC register.

When multiple peripheral function outputs are assigned to a pin, the PSC register select which peripheral

function output is used.

Refer to 24.9 Analog Input and Other Peripheral Function Input for the PSC_7 bit in the PSC register.

24.6 Pull-up Control Register 0 to 4 (PUR0 to PUR4 Registers)

Figures 24.15 to 24.16 show the PUR0 to PUR4 registers.

The PUR0 to PUR4 registers select whether the ports, divided into groups of four ports, are pulled up or not.

Ports with bits in the PUR0 to PUR4 registers set to "1" (pull-up) and the direction registers set to "0" (input

mode) are pulled up.

Set bits in the PUR0 and PUR1 registers which control P0 to P5, running as bus, to "0" (no pull-up) in

memory expansion and microprocessor mode. P0, P1, P40 to P43 can be pulled up when they are used as

input ports in memory expansion mode and microprocessor mode.

24.7 Port Control Register (PCR Register)

Figure 24.17 shows the PCR register.

The PCR register selects either CMOS output or N-channel open drain output as the P1 output format. If

the PCR0 bits is set to "1" (N-channel open drain output), N-channel open drain output is selected because

the P-channel in the CMOS port is turned off. This is, however, not a perfect open drain. Therefore, the

absolute maximum rating of the input voltage is from -0.3V to Vcc + 0.3V.

If P1 is used as the data bus in memory expansion and microprocessor mode, set the PCR0 bit to "0"

(CMOS output). If P1 is used as a port in memory expansion and microprocessor mode, the PCR0 bit

determines the output format.

24.8 Input Function Select Register (IPS Register)

Figure 24.18 shows the IPS registers.

The IPS0 to IPS1 and IPS3 bits in the IPS register and the IPSA_0 and IPSA_3 bits in the IPSA register

select which pin is assigned the intelligent I/O or CAN input functions.

Refer to 24.9 Analog Input and Other Peripheral Function Input for the IPS2 bit.

24.9 Analog Input and Other Peripheral Function Input

The PSL3_3 to PSL3_6 bits in the PSL3 register, the PSC_7 bit in the PSC register and the IPS2 bit in the

IPS register each separate analog I/O ports from other peripheral functions. Setting the corresponding bit to

"1" (analog I/O) to use the analog I/O port (DA0, DA1, ANEX0, ANEX1, AN4 to AN7 or AN150 to AN157)

prevents an intermediate potential from being impressed to other peripheral functions. The impressed inter-

mediate potential may cause increase in power consumption.

Set the corresponding bit to "0" (except analog I/O) when analog I/O is not used. All peripheral function

inputs except the analog I/O port are available when the corresponding bit is set to "0". These inputs are

indeterminate when the bit is set to "1". When the PSC_7 bit is set to "1", key input interrupt request remains

_____

unchanged regardless of KI0 to KI3 pin input level change.

M32C83T Datasheet(PDF) 390 Page - Renesas Technology Corp

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