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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 />

(5) Port output mode register (POM)<br />

This register sets the output mode of P30, P31, P50, P60, P61, P136 in 1-bit units.<br />

N-ch open drain output (VDD tolerance) mode can be selected during serial communication with an external device of<br />

the different potential, and for the SDA11 and SCL11 pins during simplified I2C communication with an external<br />

device of the same potential.<br />

This register can be set by a 1-bit or 8-bit memory manipulation instruction.<br />

Reset signal generation clears this register to 00H.<br />

(a) 48-pin products<br />

(b) 64-pin products<br />

(c) 80-pin products<br />

(d) 100-pin products<br />

Figure 4-55. Format of Port input mode Register<br />

Symbol 7 6 5 4 3 2 1 0 Address After reset R/W<br />

POM 0 0 0 0 POM3 POM2 POM1 POM0 F006F 00H R/W<br />

Symbol 7 6 5 4 3 2 1 0 Address After reset R/W<br />

POM 0 0 0 0 POM3 POM2 POM1 POM0 F006F 00H R/W<br />

Symbol 7 6 5 4 3 2 1 0 Address After reset R/W<br />

POM 0 0 0 0 POM3 POM2 POM1 POM0 F006F 00H R/W<br />

Symbol 7 6 5 4 3 2 1 0 Address After reset R/W<br />

POM 0 0 POM5 POM4 POM3 POM2 POM1 POM0 F006F 00H R/W<br />

POMn Port output mode selection (n = 0 to 5)<br />

0 Normal output (CMOS) mode<br />

1 Nch-OD output (VDD tolerance) mode<br />

Bit name POM5 POM4 POM3 POM2 POM1 POM0<br />

Port output<br />

function<br />

P50<br />

/TO02<br />

/SDA11<br />

P136<br />

/TO00<br />

/SCL11<br />

P31<br />

/TO21<br />

/SDA11<br />

P30<br />

/TO20<br />

/SCL11<br />

P61<br />

/TO21<br />

/SDA11<br />

P60<br />

/TO20<br />

/SCL11<br />

Remark If use the alternate function of IIC, port output need to be set as Nch open-drain (Nch-OD) output. At that<br />

time, POM forces on-chip pull-up resistors should not be active (disabled by circuit).<br />

R01UH0317EJ0004 Rev. 0.04 228<br />

Feb. 22, 2013

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