HD6417709SF133B Renesas Electronics America, HD6417709SF133B Datasheet - Page 503

• Manufacturer Part Number: HD6417709SF133B
• Description: IC SUPERH MPU ROMLESS 208LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417709SF133B

• Core Processor: SH-3
• Core Size: 32-Bit
• Speed: 133MHz
• Connectivity: EBI/EMI, FIFO, IrDA, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 96
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 2.05 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 208-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -

When the SCI operates on an internal clock, it can output a clock signal at the SCK pin. The
frequency of this output clock is equal to the bit rate. The phase is aligned as in figure 14.6 so that
the rising edge of the clock occurs at the center of each transmit data bit.
Transmitting and Receiving Data (SCI Initialization (Asynchronous Mode)): Before
transmitting or receiving, clear the TE and RE bits to 0 in the serial control register (SCSCR), then
initialize the SCI as follows.
When changing the operation 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 shift register (SCTSR). Clearing RE to 0, however, does not initialize the RDRF, PER,
FER, and ORER flags or receive data register (SCRDR), which retain their previous contents.
When an external clock is used, the clock should not be stopped during initialization or subsequent
operation. SCI operation becomes unreliable if the clock is stopped.
Figure 14.7 shows a sample flowchart for initializing the SCI. The procedure for initializing the
SCI is:
1. Select the clock source in the serial control register (SCSCR). Leave RIE, TIE, TEIE, MPIE,
2. Select the communication format in the serial mode register (SCSMR).
3. Write the value corresponding to the bit rate in the bit rate register (SCBRR) (not necessary if
4. Wait for at least the interval required to transmit or receive one bit, then set TE or RE in the
TE, and RE cleared to 0. If clock output is selected in asynchronous mode, clock output starts
immediately after the setting is made in SCSCR.
an external clock is used).
serial control register (SCSCR) to 1. Also set RIE, TIE, TEIE, and MPIE as necessary. Setting
TE or RE enables the SCI to use the TxD or RxD pin. The initial state is the mark state when
transmitting, or the idle state (waiting for a start bit) when receiving.
Figure 14.6 Output Clock and Serial Data Timing (Asynchronous Mode)
0
D0
D1
D2
D3
1 frame
D4
D5
D6
D7
0/1
Rev. 5.00, 09/03, page 457 of 760
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