M30222 Datasheet, PDF (121/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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Specifications in this manual are tentative and subject to change
MITSUBISHI MICROCOMPUTERS
M30222 Group
Rev. G
Clock Asynchronous Serial I/O Mode
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Table 1.39lists the functions of the input/output pins during UART mode. This table shows the pin functions
when the separate CTS/RTS 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 a “H”. (If the N-channel open-drain
is selected, this pin is in floating state).
Figures 1.94 and 1.95 show the typical transmit timings in UART mode (UART0, UART1, UART2). Figure
1.96 shows the typical receive timing in UART mode.
Table 1.39. Input/output pin functions in UART mode
Pin name
Function
TxDi
Serial data output
(P63, P67, P70)
RxDi
Serial data input
(P62, P66, P71)
Method of selection
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)
CLKi
Programmable I/O port
(P61, P65, P72) _{Transfer clock input}
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) = “1”
Port P61, P65 direction register (bits 1 and 5 at address 03EE 16) = “0”
CTSi/RTSi
CTS input
(P60, P64, P73)
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
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”
Programmable I/O port CTS/RTS disable bit (bit 4 at address 03A4 16, 03AC16, 037C16) = “1”
(When separate CTS/RTS pins function is not selected)
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