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RL78/G1H CHAPTER 5 PORT FUNCTIONS

R01UH0575EJ0120 Rev. 1.20 Page 87 of 920

Dec 22, 2016

5.5 Register Settings When Using Alternate Function

5.5.1 Basic concept when using alternate function

In the beginning, for a pin also assigned to be used for analog function, use the ADPC register or port mode control

Figure 5 - 8 shows the basic configuration of an output circuit for pins used for digital input/output. The output of the

output latch for the port and the output of the alternate SAU function are input to an AND gate. The output of the

AND gate is input to an OR gate. The output of an alternate function other than SAU (Timer, RTC, clock/buzzer

output, IICA, etc.) is connected to the other input pin of the OR gate. When such kind of pins are used by the port

function or an alternate function, the unused alternate function must not hinder the output of the function to be used.

An idea of basic settings for this kind of case is shown in Table 5 - 6.

Figure 5 - 8 Basic Configuration of Output Circuit for Pins

Note 1. When there is no POM register, this signal should be considered to be low level (0).

Note 2. When there is no alternate function, this signal should be considered to be high level (1).

Note 3. When there is no alternate function, this signal should be considered to be low level (0).

Internal bus

WRPOM

WRPORT

POM register

(POMmn)

Output latch

(Pmn)

WRPM

PM register

(PMmn)

Alternate function

(SAU)

Alternate function

(other than SAU)

Note 1

Note 2

Note 3

N-ch

P-ch

VSS

Pmn/

Alternate function

To input circuit

Renesas RL78/G1H User Manual

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