HD64F7144F50V Renesas Electronics America, HD64F7144F50V Datasheet - Page 436

• Manufacturer Part Number: HD64F7144F50V
• Description: IC SUPERH MCU FLASH 256K 112QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7144r

Specifications of HD64F7144F50V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 74
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 112-QFP
• For Use With: HS0005KCU11H - EMULATOR E10A-USB H8S(X),SH2(A)EDK7145 - DEV EVALUATION KIT SH7145
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

12. Watchdog Timer
Reading from TCNT, TCSR, and RSTCSR: TCNT, TCSR, and RSTCSR are read like other
registers. Use byte transfer instructions. The read addresses are H'FFFF8610 for TCSR,
H'FFFF8611 for TCNT, and H'FFFF8613 for RSTCSR.
12.6.2
If a timer counter increment clock pulse is generated during the T3 state of a write cycle to TCNT,
the write takes priority and the timer counter is not incremented. Figure 12.8 shows this operation.
Rev.4.00 Mar. 27, 2008 Page 390 of 882
REJ09B0108-0400
TCNT Write and Increment Contention
• Writing 0 to the WOVF bit
• Writing to the RSTE and RSTS bits
Address: H'FFFF8612
Address: H'FFFF8612
Figure 12.8 Contention between TCNT Write and Increment
Address
Internal write
signal
TCNT input
clock
TCNT
φ
Figure 12.7 Writing to RSTCSR
15
15
TCNT write cycle
T 1
H'A5
H'5A
TCNT address
N
T 2
8
8
Counter write data
7
7
T 3
M
Write data
H’00
0
0