D12320VF25IV Datasheet, PDF (426/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 9 I/O Ports
9.8 Port A
9.8.1 Overview
Port A is an 8-bit I/O port. Port A pins also function as address bus outputs and interrupt input
pins (IRQ₄ to IRQ₇). The pin functions change according to the operating mode. IRQ₄ to IRQ₇
input can be switched to P5₀ to P5₃ by setting the IRQPAS bit in SYSCR to 1. The address output
or port output function can be selected by means of bits A23E to A20E in PFCR1.
Port A has a built-in MOS input pull-up function that can be controlled by software. Pins PA₇ to
PA₄ are Schmitt-triggered inputs.
Figure 9.7 shows the port A pin configuration.
Port A
Port A pins
PA₇ / A₂₃ / IRQ₇
PA₆ / A₂₂ / IRQ₆
PA₅ / A₂₁ / IRQ₅
PA₄ / A₂₀ / IRQ₄
PA₃ / A₁₉
PA₂ / A₁₈
PA₁ / A₁₇
PA₀ / A₁₆
Pin functions in modes 4 and 5
PA₇ (I/O) / A₂₃ (output) / IRQ₇ (input)
PA₆ (I/O) / A₂₂ (output) / IRQ₆ (input)
PA₅ (I/O) / A₂₁ (output) / IRQ₅ (input)
PA₄ (output) / A₂₀ (output)
A₁₉ (output)
A₁₈ (output)
A₁₇ (output)
A₁₆ (output)
Pin functions in mode 6
Pin functions in mode 7
PA₇ (I/O) / A₂₃ (output) / IRQ₇ (input)
PA₆ (I/O) / A₂₂ (output) / IRQ₆ (input)
PA₅ (I/O) / A₂₁ (output) / IRQ₅ (input)
PA₄ (I/O) / A₂₀ (output) / IRQ₄ (input)
PA3 (input) / A₁₉ (output)
PA₂ (input) / A₁₈ (output)
PA1 (input) / A₁₇ (output)
PA₀ (input) / A₁₆ (output)
PA₇ (I/O) / IRQ₇ (input)
PA₆ (I/O) / IRQ₆ (input)
PA₅ (I/O) / IRQ₅ (input)
PA₄ (I/O) / IRQ₄ (input)
PA₃ (I/O)
PA₂ (I/O)
PA₁ (I/O)
PA₀ (I/O)
Figure 9.7 Port A Pin Functions
Rev.6.00 Sep. 27, 2007 Page 394 of 1268
REJ09B0220-0600