m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 260
m37905
Manufacturer Part Number
m37905
Description
Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.M37905.pdf
(565 pages)
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(1) Serial I/O mode select bits (bits 0 to 2)
(2) Internal/External clock select bit (bit 3)
(3) Stop bit length select bit, Odd/Even parity select bit, Parity enable bit (bits 4 to 6)
(4) Sleep select bit (bit 7)
These bits select a UARTi’s operating mode.
Refer to section “11.4.2 Transfer data format.”
Refer to section “11.4.8 Sleep mode.”
Clock synchronous serial I/O mode
By clearing this bit to “0” in order to select an internal clock, the clock which is selected with the
BRG count source select bits (bits 0 and 1 at addresses 34
source of the BRGi. (Refer to section “11.2.6 UARTi baud rate register (BRGi).”) The BRGi’s
output divided by 2 becomes the transfer clock. Additionally, the transfer clock is output from the
CLK
By setting this bit to “1” in order to select an external clock, the clock input to the CLK
becomes the transfer clock.
UART mode
By clearing this bit to “0” in order to select an internal clock, the clock which is selected with the
BRG count source select bits (bits 0 and 1 at addresses 34
source of the BRGi. (Refer to section “11.2.6 UARTi baud rate register (BRGi).”) Then, the CLK
pin functions as a programmable I/O port pin.
By setting this bit to “1” in order to select an external clock, the clock input to the CLK
becomes the count source of BRGi.
Always in the UART mode, the BRGi’s output divided by 16 becomes the transfer clock.
i
pin.
7905 Group User’s Manual Rev.1.0
16
16
, 3C
, 3C
16
16
and B4
and B4
11.2 Block description
16
16
SERIAL I/O
) becomes the count
) becomes the count
11-5
i
i
pin
pin
i
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