M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 349

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

Clock-Synchronous Serial I/O
334
Operation
2.4.2 Operation of Serial I/O (transmission in clock-synchronous serial I/O mode)
In transmitting data in clock-synchronous serial I/O mode, choose functions from those listed in Table
2.4.1. Operations of the circled items are described below. Figure 2.4.7 shows the operation timing, and
Figures 2.4.8 and 2.4.9 show the set-up procedures.
(1) Setting the transmit enable bit to “1” and writing transmission data to the UARTi transmit
(2) When input to the CTSi pin goes to “L” level, transmission starts (the CTSi pin must be
(3) In synchronization with the first falling edge of the transfer clock, transmission data held in the
(4) When transmission of 1-byte data is completed, the transmit register empty flag goes to “1”,
(5) If the next transmission data is set in the UARTi transmit buffer register while transmission is
Table 2.4.1. Choosed functions
Note 1: This can be selected only when UART1 is used in combination with the internal clock. When this function is
Note 2: UART0 only. (UART1 CTS/RTS function cannot be used when this function is selected.)
Note 3: UART2 only.
CTS function
CLK polarity
Transfer clock
Transfer clock
source
buffer register makes data transmissible status ready.
controlled on the reception side).
UARTi transmit buffer register is transmitted to the UARTi transmit register. At this time, the
UARTi transmit interrupt request bit goes to “1”. Also, the first bit of the transmission data is
transmitted from the TxDi pin. Then the data is transmitted bit by bit from the lower order in
synchronization with the falling edges.
which indicates that transmission is completed. The transfer clock stops at “H” level.
in progress (before the eighth bit has been transmitted), the data is transmitted in succession.
selected, neither UART1 CTS/RTS function, nor UART0 CTS/RTS separation function can be utilized. Set the
UART1 CTS/RTS disable bit to “1”.
Item
_______ _______
O
O
O
O
________
LSB first
Internal clock (f
External clock (CLKi pin)
CTS function enabled
Output transmission data at
the falling edge of the
transfer clock
MSB first
CTS function disabled
Output transmission data at
the rising edge of the
transfer clock
_______ _______
_______ _______
Set-up
1
/ f
8
/ f
32
)
Output transfer clock
to multiple pins
(Note 1)
Transmission
interrupt factor
CTS / RTS
separation function
(Note 2)
Data logic select
function
(Note 3)
T
polarity reverse bit
(Note 3)
X
D, R
_______ _______
X
Item
D I/O
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
O
O
O
O
O
Not selected
Selected
Pin shared by CTS and RTS
No reverse
Reverse
No reverse
Reverse
Transmission buffer empty
Transmission complete
CTS and RTS separated
Mitsubishi microcomputers
M16C / 62 Group
_______
Set-up