M16C26 Datasheet, PDF (129/239 Pages) Renesas Technology Corp – 16-BIT CMOS SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES

Udenvdeelropment
Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative
Clock Synchronous Serial I/O Mode
and
subject to change.
SINGLE-CHIP 16-BIT
M16C/26 Group
CMOS MICROCOMPUTER
Table 1.15.5 lists the functions of the input/output pins during clock synchronous serial I/O mode. This
table shows the pin functions when the transfer clock output from multiple pins function is not selected.
Note that for a period from when the UARTi operation mode is selected to when transfer starts, the TxDi
pin outputs an “H”. (If the N-channel open-drain is selected, this pin is in floating state.)
Table 1.15.5. Input/output pin functions in clock synchronous serial I/O mode
(when transfer clock output from multiple pins is not selected)
Pin name
Function
TxDi
Serial data output
(P63, P67, P70)
RxDi
Serial data input
(P62, P66, P71)
CLKi
Transfer clock output
(P61, P65, P72)
Transfer clock input
CTSi/RTSi
CTS input
(P60, P64, P73)
RTS output
Programmable I/O port
Method of selection
(Outputs dummy data when performing reception only)
Port P62, P66 and P71 direction register (bits 2 and 6 at address 03EE16,
bit 1 at address 03EF16)= 0
(Can be used as an input port when performing transmission only)
Internal/external clock select bit (bit 3 at address 03A016, 03A816, 037816) = 0
Internal/external clock select bit (bit 3 at address 03A016, 03A816, 037816) = 1
Port P61, P65 and P72 direction register (bits 1 and 5 at address 03EE16,
bit 2 at address 03EF16) = 0
CTS/RTS disable bit (bit 4 at address 03A416, 03AC16, 037C16) = 0
CTS/RTS function select bit (bit 2 at address 03A416, 03AC16, 037C16) = 0
Port P60, P64 and P73 direction register (bits 0 and 4 at address 03EE16,
bit 3 at address 03EF16) = 0
CTS/RTS disable bit (bit 4 at address 03A416, 03AC16, 037C16) = 0
CTS/RTS function select bit (bit 2 at address 03A416, 03AC16, 037C16) = 1
CTS/RTS disable bit (bit 4 at address 03A416, 03AC16, 037C16) = 1
Table 1.15.6. P64 pin function in clock synchronous serial I/O mode
Pin function
Bit set value
P64
CTS1
RTS1
CTS0(Note1)
CLKS1
U1C0 register
CRD CRS
1
0
0
0
1
0
0
UCON register
RCSP CLKMD1 CLKMD0
0
0
0
0
0
0
1
0
0
1(Note 2)
1
PD6 register
PD6_4
Input: 0, Output: 1
0
Note 1: In addition to this, set the U0C0 register’s CRD bit to “0” (CTS0/RTS0 enabled) and the U0
C0 register’s CRS bit to “1” (RTS0 selected).
Note 2: When the CLKMD1 bit = 1 and the CLKMD0 bit = 0, the following logic levels are output:
• High if the U1C0 register’s CLKPOL bit = 0
• Low if the U1C0 register’s CLKPOL bit = 1
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