R8C2C datasheet(74/615 Pages) RENESAS

74 / 615 page

R8C/2C Group, R8C/2D Group

7. Programmable I/O Ports

Rev.2.00

Dec 05, 2007

Page 53 of 585

REJ09B0339-0200

Programmable I/O Ports

There are 71 programmable Input/Output ports (I/O ports) P0 to P3, P4_3 to P4_5, P5 to P8 and P9_0 to P9_3. Also,

P4_6 and P4_7 can be used as input-only ports if the XIN clock oscillation circuit is not used.

Table 7.1 lists an Overview of Programmable I/O Ports.

NOTES:

1. In input mode, whether an internal pull-up resistor is connected or not can be selected by registers

PUR0, PUR1, and PUR2.

2. When the XIN clock oscillation circuit is not used, these ports can be used as the input-only ports.

7.1

Functions of Programmable I/O Ports

The PDi_j (j = 0 to 7) bit in the PDi (i = 0 to 9) register controls I/O of the ports P0 to P3, P4_3 to P4_5, P5 to P8

and P9_0 to P9_3. The Pi register consists of a port latch to hold output data and a circuit to read pin states.

Figures 7.1 to 7.11 show the Configurations of Programmable I/O Ports. Figure 7.12 shows the Configuration of

I/O Pins. Table 7.2 lists the Functions of Programmable I/O Ports. Also, Figure 7.13 shows the PDi (i = 0 to 9)

Registers. Figure 7.14 shows the Pi (i = 0 to 9) Registers, Figure 7.15 shows the P2DRR Register, Figure 7.16

shows the PMR Register, and Figure 7.17 shows Registers PUR0, PUR1, and PUR2.

i = 0 to 9, j = 0 to 7

NOTE:

1. Nothing is assigned to bits PD4_0 to PD4_2, PD4_6, and PD4_7.

Table 7.1

Overview of Programmable I/O Ports

Ports

I/O

Type of Output

I/O Setting

Internal Pull-Up Resister

P0 to P3, P5 to P8, P9_0

to P9_3

I/O CMOS3 State

Set per bit

Set every 4 bits(1)

P4_3

I/O CMOS3 State

Set per bit

Set every bit(1)

P4_4, P4_5

I/O CMOS3 State

Set per bit

Set every 2 bits(1)

P4_6, P4_7(2)

(No output function)

None

Table 7.2

Functions of Programmable I/O Ports

Operation When

Accessing

Pi Register

Value of PDi_j Bit in PDi Register(1)

When PDi_j Bit is Set to 0 (Input Mode)

When PDi_j Bit is Set to 1 (Output Mode)

Reading

Read pin input level

Read the port latch

Writing

Write to the port latch

Write to the port latch. The value written to

the port latch is output from the pin.

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