DF2437FV Renesas Electronics America, DF2437FV Datasheet - Page 379

• Manufacturer Part Number: DF2437FV
• Description: IC H8S/2437 MCU FLASH 128QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2400r

Specifications of DF2437FV

• Core Processor: H8S/2600
• Core Size: 16-Bit
• Speed: 20MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 128-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

• Free-Running Count Operation and Periodic Count Operation
Immediately after a reset, the TPU's TCNT counters are all designated as free-running
counters. When the relevant bit in TSTR is set to 1, the corresponding TCNT counter starts up-
count operation as a free-running counter. When TCNT overflows (from H'FFFF to H'0000),
the TCFV bit in TSR is set to 1. If the value of the corresponding TCIEV bit in TIER is 1 at
this point, the TPU requests an interrupt. After overflow, TCNT starts counting up again from
H'0000.
Figure 12.7 illustrates free-running counter operation.
When compare match is selected as the TCNT clearing source, TCNT for the relevant channel
performs periodic count operation. TGR for setting the period is designated as an output
compare register, and counter clearing by compare match is selected by means of bits CCLR2
to CCLR0 in TCR. After the settings have been made, TCNT starts up-count operation as a
periodic counter when the corresponding bit in TSTR is set to 1. When the count value
matches the value in TGR, the TGF bit in TSR is set to 1 and TCNT is cleared to H'0000.
If the value of the corresponding TGIE bit in TIER is 1 at this point, the TPU requests an
interrupt. After a compare match, TCNT starts counting up again from H'0000.
Figure 12.8 illustrates periodic counter operation.
H'FFFF
H'0000
CST bit
TCFV
TCNT value
Figure 12.7 Free-Running Counter Operation
Rev.2.00 May. 28, 2009 Page 339 of 732
REJ09B0059-0200
Time