HD6477021X20V Renesas Electronics America, HD6477021X20V Datasheet - Page 266

• Manufacturer Part Number: HD6477021X20V
• Description: MCU 5V 32K PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7020r

Specifications of HD6477021X20V

• Core Processor: SH-1
• Core Size: 32-Bit
• Speed: 20MHz
• Connectivity: EBI/EMI, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

• TCNT counter timing
248 RENESAS
Internal clock
Internal clock source: Bits TPSC2–TPSC0 in the TCR select the system clock (CK) or one of
three internal clock sources ( /2, /4, /8) obtained by prescaling the system clock. Figure
10.17 shows the timing.
External clock source: The external clock input pin (TCLKA–TCLKD) source is selected by
bits TPSC2–TPSC0 in the TCR and its valid edges are selected with the CKEG1 and CKEG0
bits of the TCR. The rising edge, falling edge, or both edges can be selected. The pulse width
of the external clock signal must be at least 1.5 system clocks when a single edge is selected
and at least 2.5 system clocks when both edges are selected. Shorter pulses will not be counted
correctly. Figure 10.18 shows the timing when both edges are detected.
TCNT value
TCNT input
STR0–STR4
H'0000
clock
TCNT value
CK
IMF
GR
Figure 10.17 Count Timing for Internal Clock Sources
N – 1
Figure 10.16 Periodic Counter Operation
N
Counter cleared by
GR compare match
N + 1
Time