H8SLASH3028F datasheet(315/923 Pages) RENESAS

315 / 923 page

Rev. 2.00, 09/03, page 285 of 890

8.11

Port A

8.11.1

Overview

Port A is an 8-bit input/output port that is also used for output (TP7 to TP0) from the

programmable timing pattern controller (TPC), input and output, (TIOCB2, TIOCA2, TIOCB1,

TIOCA1, TIOCB0, TIOCA0, TCLKD, TCLKC, TCLKB, TCLKA) by the 16-bit timer, input

(TCLKD, TCLKC, TCLKB, TCLKA) to the 8-bit timer, output (

TEND

1, TEND0) from the DMA

controller (DMAC), and address output (A23 to A20). A reset or hardware standby transition leaves

port A as an input port, except that in modes 3 and 4, one pin is always used for A20 output. See

table 8.19 to 8.21 for the selection of pin functions.

Usage of pins for TPC, 16-bit timer, 8-bit timer, and DMAC input and output is described in the

sections on those modules. For output of address bits A23 to A20 in modes 3, 4, and 5, see section

6.2.4, Bus Release Control Register (BRCR). Pins not assigned to any of these functions are

available for generic input/output. Figure 8.10 shows the pin configuration of port A.

Pins in port A can drive one TTL load and a 30-pF capacitive load. They can also drive a

darlington transistor pair. Port A has Schmitt-trigger inputs.

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