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RL78/D1A User's Manual: Hardware - Renesas

RL78/D1A User's Manual: Hardware - Renesas

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Under development<br />

Preliminary document<br />

Specifications in this document are tentative and subject to change.<br />

<strong>RL78</strong>/<strong>D1A</strong> CHAPTER 4 PORT FUNCTIONS<br />

WRPU<br />

RD<br />

WRPORT<br />

WRPM<br />

WRLCDPF<br />

Figure 4-31. Block Diagram of P74<br />

PU7<br />

PU74<br />

Alternate<br />

function<br />

P7<br />

Output latch<br />

(P74)<br />

PM7<br />

PM74<br />

Alternate<br />

function<br />

(TO23)<br />

Alternate<br />

function<br />

(SCK01)<br />

LCD controller/driver<br />

LCDPF7<br />

PF74<br />

P7: Port register 7<br />

PU7: Pull-up resistor option register 7<br />

PM7: Port mode register 7<br />

LCDPF7: LCD port function registers 7<br />

RD: Read signal<br />

WRxx: Write signal<br />

P74/SCK01/<br />

TI23/TO23/<br />

SEG26<br />

Caution When using the alternate function TO23, set the port latch to 0.<br />

When using the alternate function SCK01, set the port latch to 1.<br />

When using P74 as a general-purpose port, specify the port settings so that the alternate function<br />

outputs are fixed (Timer to 0 and Serial to 1).<br />

R01UH0317EJ0004 Rev. 0.04 184<br />

Feb. 22, 2013<br />

EVDD<br />

P-ch

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