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Page 140
17. Clock synchronous serial I/O mode
p
u
o
r
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0
8
/
C
6
1
M
Table 17.3 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 and the separate CTS/
_______
RTS pins functions are not selected. Note that for a period from when the UARTi operation mode is
selected to when transfer starts, the TxDi pin outputs a “H”. (If the N-channel open drain is selected, this
pin is in floating state.)
Table 17.3 Input/output pin functions in clock synchronous serial I/O mode
Pin name
Function
Method of selection
TxDi
(P63, P67, P70,
P92, P96)
Serial data output
(Note 1)
Serial data input
(Note 2)
Transfer clock output
(Note 1)
Transfer clock input
(Note 2)
Programmable I/O port
(Note 2)
(Outputs dummy data when performing reception only)
RxDi
(P62, P66, P71,
P91, P97)
CLKi
(P61, P65, P72,
P90, P95)
Internal/external clock select bit (bit 3 at addresses 036016, 036816,
033816, 032816, 02F816) = “0”
Internal/external clock select bit (bit 3 at addresses 036016, 036816,
033816, 032816, 02F816) = “1”
Port P61, P65, P72, P90 and P95 direction register (bits 1 and 5 at address
03C216, bit 2 at address 03C316, bit 0 and 5 at address 03C716) = “0”
Port P62, P66, P71, P91 and P97 direction register (bits 2 and 6 at address
03C216, bit 1 at address 03C316, bit 1 and 7 at address 03C716)= “0”
(Can be used as an input port when performing transmission only)
CTS/RTS disable bit (bit 4 at addresses 036416, 036C16, 033C16, 032C16,
02FC16) =“0”
CTS/RTS function select bit (bit 2 at addresses 036416, 036C16, 033C16,
032C16, 02FC16) = “0”
Port P60, P64, P73, P93 and P94 direction register (bits 0 and 4 at address
03C216, bit 3 at address 03C316, bits 3 and 4 at address 03C716) = “0”
CTS/RTS disable bit (bit 4 at addresses 036416, 036C16, 033C16,
032C16, 02FC16) = “0”
CTS/RTS function select bit (bit 2 at addresses 036416, 036C16, 033C16,
032C16, 02FC16) = “1”
CTS/RTS disable bit (bit 4 at addresses 036416, 036C16, 033C16,
032C16, 02FC16) = “1”
CTS input
(Note 2)
RTS output (Note 1)
CTSi/RTSi
(P60, P64, P73,
P93, P94)
_______ _______
(when transfer clock output from multiple pins and separate CTS/RTS pins functions are not selected)
________
Note 1: Select TxD output, CLK output and RTS output by the corresponding function select registers A, B
and C.
Note 2: Select I/O port by the corresponding function select register A.