DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 496
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DF2211NP24V
Manufacturer Part Number
DF2211NP24V
Description
H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
Manufacturer
Renesas Technology / Hitachi Semiconductor
Datasheet
1.DF2211NP24V.pdf
(756 pages)
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12.10.3 Mark State and Break Detection (Asynchronous Mode Only)
When TE is 0, the TxD pin is used as an I/O port whose direction (input or output) and level are
determined by DR and DDR. This can be used to set the TxD pin to mark state (high level) or send
a break during serial data transmission. To maintain the communication line at mark state until TE
is set to 1, set both DDR and DR to 1. As TE is cleared to 0 at this point, the TxD pin becomes an
I/O port, and 1 is output from the TxD pin. To send a break during serial transmission, first set
PCR to 1 and PDR to 0, and then clear TE to 0. When TE is cleared to 0, the transmitter is
initialized regardless of the current transmission state, the TxD pin becomes an I/O port, and 0 is
output from the TxD pin.
12.10.4 Receive Error Flags and Transmit Operations (Clocked Synchronous Mode Only)
Transmission cannot be started when a receive error flag (ORER, PER, or FER) is set to 1, even if
the TDRE flag is cleared to 0. Be sure to clear the receive error flags to 0 before starting
transmission. Note also that receive error flags cannot be cleared to 0 even if the RE bit is cleared
to 0.
12.10.5 Restrictions on Use of DMAC
• When an external clock source is used as the serial clock, the transmit clock should not be
• When RDR is read by the DMAC, be sure to set the activation source to the relevant SCI
Rev.7.00 Dec. 24, 2008 Page 442 of 698
REJ09B0074-0700
input until at least 5 φ clock cycles after TDR is updated by the DMAC. Misoperation may
occur if the transmit clock is input within 4 φ clocks after TDR is updated. (figure 12.38)
SCK
TDRE
Serial data
Note: When operating on an external clock, set t>4 clocks.
reception end interrupt (RXI).
Figure 12.38 Example of Clocked Synchronous Transmission by DMAC
t
LSB
D0
D1
D2
D3
D4
D5
D6
D7
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