RL78/G1H CHAPTER 5 PORT FUNCTIONS
R01UH0575EJ0120 Rev. 1.20 Page 88 of 920
Dec 22, 2016
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
5.5.2 Register settings for alternate
function whose output function is not used
.
5.5.2 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.
(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.
Table 5 - 6 Concept of Basic Settings
Output Function of Used Pin
Output Settings of Unused Alternate Function
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
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