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Rev.1.02 Jul 01, 2005 page 149 of 314
REJ09B0126-0102
M16C/6N Group (M16C/6NL, M16C/6NN) 14. Serial I/O
Under development
This document is under development and its contents are subject to change.
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14.1.2.6 CTS/RTS Function
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When the CTS function is used transmit operation start when “L” is applied to the CTSi/RTSi (i = 0 to 2)
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pin. Transmit operation begins when the CTSi/RTSi pin is held “L”. If the “L” signal is switched to “H”
during a transmit operation, the operation stops before the next data.
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When the RTS function is used, the CTSi/RTSi pin outputs on “L” signal when the microcomputer is
ready to receive. The output level becomes “H” on the first falling edge of the CLKi pin.
•
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CRD bit in UiC0 register = 1 (disables UART0 CTS/RTS function) CTSi/RTSi pin is programmable I/O function
•
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CRD bit = 0, CRS bit in UiC0 register= 0 (CTS function is selected)
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CTSi/RTSi pin is CTS function
•
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CRD bit = 0, CRS bit = 1 (RTS function is selected)
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CTSi/RTSi pin is RTS function
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14.1.2.7 CTS/RTS Separate Function (UART0)
_________ _________ ________ _________
This function separates CTS0/RTS0, outputs RTS0 from the P6_0 pin, and accepts as input the CTS0
from the P6_4 pin. To use this function, set the register bits as shown below.
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• CRD bit in U0C0 register = 0 (enables UART0 CTS/RTS)
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• CRS bit in U0C0 register = 1 (outputs UART0 RTS)
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• CRD bit in U1C0 register = 0 (enables UART1 CTS/RTS)
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• CRS bit in U1C0 register = 0 (inputs UART1 CTS)
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• RCSP bit in UCON register = 1 (inputs CTS0 from the P6_4 pin)
• CLKMD1 bit in UCON register = 0 (CLKS1 not used)
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Note that when using the CTS/RTS separate function, UART1 CTS/RTS separate function cannot be used.
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Figure 14.22 shows CTS/RTS separate function usage.
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Figure 14.22 CTS/RTS Separate Function
Microcomputer
IN
OUT
CTS
RTS
IC
TXD0(P6_3)
RXD0(P6_2)
RTS0(P6_0)
CTS0(P6_4)