DF2357F20 Renesas Electronics America, DF2357F20 Datasheet - Page 521

• Manufacturer Part Number: DF2357F20
• Description: IC H8S MCU FLASH 5V 128K 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2357F20

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 87
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Clock: Either an internal clock generated by the on-chip baud rate generator or an external clock input at the SCK pin can
be selected as the SCI’s serial clock, according to the setting of the C/A bit in SMR and the CKE1 and CKE0 bits in SCR.
For details of SCI clock source selection, see table 14-9.
When an external clock is input at the SCK pin, the clock frequency should be 16 times the bit rate used.
When the SCI is operated on an internal clock, the clock can be output from the SCK pin. The frequency of the clock
output in this case is equal to the bit rate, and the phase is such that the rising edge of the clock is in the middle of the
transmit data, as shown in figure 14-3.
Data Transfer Operations:
SCI initialization (asynchronous mode)
Before transmitting and receiving data, you should first clear the TE and RE bits in SCR to 0, then initialize the SCI as
described below.
When the operating mode, transfer format, etc., is changed, the TE and RE bits must be cleared to 0 before making the
change using the following procedure. When the TE bit is cleared to 0, the TDRE flag is set to 1 and TSR is initialized.
Note that clearing the RE bit to 0 does not change the contents of the RDRF, PER, FER, and ORER flags, or the
contents of RDR.
When an external clock is used the clock should not be stopped during operation, including initialization, since
operation is uncertain.
0
Figure 14-3 Relation between Output Clock and Transfer Data Phase
D0
D1
D2
D3
(Asynchronous Mode)
D4
1 frame
D5
D6
D7
0/1
1
Rev.6.00 Oct.28.2004 page 491 of 1016
1
REJ09B0138-0600H