HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 435
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HD64F7050
Manufacturer Part Number
HD64F7050
Description
32-Bit RISC Microcomputer SuperH RISC engine Family/
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD64F7050.pdf
(841 pages)
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In clock synchronous serial communication, each data bit is output on the communication line
from one falling edge of the serial clock to the next. Data are guaranteed valid at the rising edge of
the serial clock. In each character, the serial data bits are transmitted in order from the LSB (first)
to the MSB (last). After output of the MSB, the communication line remains in the state of the
MSB. In the clock synchronous mode, the SCI transmits or receives data by synchronizing with
the falling edge of the synchronization clock.
Communication Format: The data length is fixed at eight bits. No parity bit or multiprocessor bit
can be added.
Clock: An internal clock generated by the on-chip baud rate generator or an external clock input
from the SCK pin can be selected as the SCI transmit/receive clock. The clock source is selected
by the C/A bit in the serial mode register (SMR) and bits CKE1 and CKE0 in the serial control
register (SCR). See table 13.9.
When the SCI operates on an internal clock, it outputs the clock signal at the SCK pin. Eight clock
pulses are output per transmitted or received character. When the SCI is not transmitting or
receiving, the clock signal remains in the high state.
Note: An overrun error occurs only during the receive operation, and the sync clock is output
SCI Initialization (Clock Synchronous Mode): Before transmitting or receiving, software must
clear the TE and RE bits to 0 in the serial control register (SCR), then initialize the SCI as follows.
When changing the mode or communication format, always clear the TE and RE bits to 0 before
following the procedure given below. Clearing TE to 0 sets TDRE to 1 and initializes the transmit
zation clock
Synchroni-
Serial data
Note: * High except in continuous transmitting or receiving.
until the RE bit is cleared to 0. When you want to perform a receive operation in one-
character units, select external clock for the clock source.
Figure 13.16 Data Format in Clock Synchronous Communication
Transfer direction
*
Bit 0
LSB
One unit (character or frame) of communication data
Bit 1
Bit 2
Section 13 Serial Communication Interface (SCI)
Bit 3
Rev. 5.00 Jan 06, 2006 page 415 of 818
Bit 4
Bit 5
Bit 6
REJ09B0273-0500
MSB
Bit 7
*
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