M30222 Datasheet, PDF (115/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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MITSUBISHI MICROCOMPUTERS
M30222 Group
Rev. G
Clock Synchronous Serial I/O Mode
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 1.36 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).
Fig. 1.88 shows a typical transmit/receive timings in clock synchronous serial I/O mode.
Table 1.36. Input/output pin functions
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)
Method of selection
(Outputs dummy data when performing reception only)
Port P62, P66 and P71 direction register (bits 2 and 6 at address 03EE 16,
bit 1 at address 03EF 16)= “0”
(Can be used as an input port when performing transmission only)
Internal/external clock select bit (bit 3 at address 03A0 16, 03A816, 037816) = “0”
Internal/external clock select bit (bit 3 at address 03A0 16, 03A816, 037816) = “1”
Port P61, P65 and P72 direction register (bits 1 and 5 at address 03EE 16,
bit 2 at address 03EF 16) = “0”
CTS/RTS disable bit (bit 4 at address 03A4 16, 03AC16, 037C16) =“0”
CTS/RTS function select bit (bit 2 at address 03A4 16, 03AC16, 037C16) = “0”
Port P60, P64 and P73 direction register (bits 0 and 4 at address 03EE 16,
bit 3 at address 03EF 16) = “0”
RTS output
Programmable I/O port
CTS/RTS disable bit (bit 4 at address 03A4 16, 03AC16, 037C16) = “0”
CTS/RTS function select bit (bit 2 at address 03A4 16, 03AC16, 037C16) = “1”
CTS/RTS disable bit (bit 4 at address 03A4 16, 03AC16, 037C16) = “1”
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