DF2398F20V Renesas Electronics America, DF2398F20V Datasheet - Page 565

• Manufacturer Part Number: DF2398F20V
• Description: IC H8S/2300 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2300r

Specifications of DF2398F20V

• 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: 256KB (256K 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
• For Use With: YR0K42378FC000BA - KIT EVAL FOR H8S/2378
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Powering On: To secure the clock duty from power-on, the following switching procedure should be followed.
[1] The initial state is port input and high impedance. Use a pull-up resistor or pull-down resistor to fix the potential.
[2] Fix the SCK pin to the specified output level with the CKE1 bit in SCR.
[3] Set SMR and SCMR, and switch to Smart Card mode operation.
[4] Set the CKE0 bit in SCR to 1 to start clock output.
15.4
The following points should be noted when using the SCI as a Smart Card interface.
Receive Data Sampling Timing and Reception Margin in Smart Card Interface Mode: In Smart Card Interface mode,
the SCI operates on a basic clock with a frequency of 372 times the transfer rate.
In reception, the SCI samples the falling edge of the start bit using the basic clock, and performs internal synchronization.
Receive data is latched internally at the rising edge of the 186th pulse of the basic clock. This is illustrated in figure 15-10.
Thus the reception margin in asynchronous mode is given by the following formula.
Usage Notes
Internal
basic
clock
Receive
data (RxD)
Synchro-
nization
sampling
timing
Data
sampling
timing
Figure 15-10 Receive Data Sampling Timing in Smart Card Mode
[1] [2] [3]
0
186 clocks
Normal operation
Figure 15-9 Clock Halt and Restart Procedure
185
372 clocks
Start bit
371
[4] [5] [6]
0
Software
standby
D0
[7] [8] [9]
Normal operation
185
Rev.6.00 Oct.28.2004 page 535 of 1016
371 0
D1
REJ09B0138-0600H