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RL78/G1A CHAPTER 4 PORT FUNCTIONS
R01UH0305EJ0200 Rev.2.00 119
Jul 04, 2013
Table 4-5. Concept of Basic Settings
Output Settings of Unused Alternate Function
Output Function of Used Pin
Output Function for Port Output Function for SAU Output Function for other than SAU
Output function for port
−
Output is high (1) Output is low (0)
Output function for SAU High (1)
−
Output is low (0)
Output function for other than
SAU
Low (0) Output is high (1) Output is low (0)
Note
Note Since more than one output function other than SAU may be assigned to a single pin, the output of an unused
alternate function must be set to low level (0). For details on the setting method, see 4.5.2 Register settings
for alternate function whose output function is not used.
4.5.2 Register settings for alternate function whose output function is not used
When the output of an alternate function of the pin is not used, the following settings should be made. Note that when
the peripheral I/O redirection function is the target, the output can be switched to another pin by setting the peripheral I/O
redirection register (PIOR). This allows usage of the port function or other alternate function assigned to the target pin.
(1) SOp = 1, TxDq = 1 (settings when the serial output (SOp/TxDq) of SAU is not used)
When the serial output (SOp/TxDq) is not used, such as, a case in which only the serial input of SAU is used, set the
bit in serial output enable register m (SOEm) which corresponds to the unused output to 0 (output disabled) and set
the SOmn bit in serial output register m (SOm) to 1 (high). These are the same settings as the initial state.
(2) SCKp = 1, SDAr = 1, SCLr = 1 (settings when channel n in SAU is not used)
When SAU is not used, set bit n (SEmn) in serial channel enable status register m (SEm) to 0 (operation stopped
state), set the bit in serial output enable register m (SOEm) which corresponds to the unused output to 0 (output
disabled), and set the SOmn and CKOmn bits in serial output register m (SOm) to 1 (high). These are the same
settings as the initial state.
(3) TOmn = 0 (settings when the output of channel n in TAU is not used)
When the TOmn output of TAU is not used, set the bit in timer output enable register 0 (TOE0) which corresponds to
the unused output to 0 (output disabled) and set the bit in timer output register 0 (TO0) to 0 (low). These are the
same settings as the initial state.
(4) SDAAn = 0, SCLAn = 0 (setting when IICA is not used)
When IICA is not used, set the IICEn bit in IICA control register n0 (IICCTLn0) to 0 (operation stopped). This is the
same setting as the initial state.
(5) PCLBUZn = 0 (setting when clock/buzzer output is not used)
When the clock/buzzer output is not used, set the PCLOEn bit in clock output select register n (CKSn) to 0 (output
disabled). This is the same setting as the initial state.
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