HD6417750RF200DV Renesas Electronics America, HD6417750RF200DV Datasheet - Page 442

• Manufacturer Part Number: HD6417750RF200DV
• Description: MPU 1.5/3.3V 0K I-TEMP PB-FREE 2
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417750RF200DV

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 28
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.35 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-QFP Exposed Pad, 208-eQFP, 208-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 12 Timer Unit (TMU)
12.5.2
If 1 is written to the UNF bit in TCR when the UNF bit is already set to 1, the UNF bit may be
cleared to 0.
The following workarounds can be used to avoid this problem.
1. Stopping channel counter operation
2. Not stopping channel counter operation
12.5.3
When performing a TCNT register read, processing for synchronization with the timer count
operation is performed. If a timer count operation and register read processing are performed
simultaneously, the TCNT counter value prior to the count-down operation is read by means of the
synchronization processing.
12.5.4
When the on-chip RTC output clock is selected as the count clock, the RTC frequency divider
should be reset.
12.5.5
Ensure that the external clock frequency for any channel does not exceed Pck/8.
Rev.7.00 Oct. 10, 2008 Page 356 of 1074
REJ09B0366-0700
Use steps (i) to (iii) below to write 1 to UNF.
(i) Stop counter operation for the channel used to write to UNF.
(ii) Disable the DMAC channels used to access peripheral modules.
(iii) While SR.BL is set to 1, write (the same value as that written to TCR and using the same
Make sure to write 0 to UNF. If it is necessary to monitor for underflows, use software to read
TCNT before and after writing to UNF and determine if an underflow has occurred.
access size (word)) to address H'FFD80080, then write 1 to UNF with the next instruction.
Underflow Flag Writes (SH7750 only)
TCNT Register Reads
Resetting the RTC Frequency Divider
External Clock Frequency