DF71251AD50FPV Renesas Electronics America, DF71251AD50FPV Datasheet - Page 419

• Manufacturer Part Number: DF71251AD50FPV
• Description: MCU RISC FLASH 32K 8K 64LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Tinyr

Specifications of DF71251AD50FPV

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 37
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(2)
Figure 10.3 shows the low-level detection operation. Sixteen continuous low levels are sampled
with the sampling clock selected by ICSR1. If even one high level is detected during this interval,
the low level is not accepted.
The timing when the high-current pins enter the high-impedance state after the sampling clock is
input is the same in both falling-edge detection and in low-level detection.
Low-Level Detection
Pφ
Sampling
clock
POE input
PE9/
TIOC3B
When low level is
sampled at all points
When high level is
sampled at least once
Note: * Other high-current pins also go to the high-impedance state at the same timing.
POE input
Note: * The other high-current pins also enter the high-impedance state in the similar timing.
Pφ
PE9/TIOC3B
Figure 10.3 Low-Level Detection Operation
1
1
8/16/128 clock
Figure 10.2 Falling Edge Detection
cycles
2
2
Pφ rising edge
Falling edge detection
High-impedance state*
3
Rev. 5.00 Mar. 06, 2009 Page 399 of 770
16
13
High-impedance
state*
Flag set
(POE received)
Flag not set
REJ09B0243-0500