UPD78F0500MC-5A4-A Renesas Electronics America, UPD78F0500MC-5A4-A Datasheet - Page 395

• Manufacturer Part Number: UPD78F0500MC-5A4-A
• Description: MCU 8BIT FLASH SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2r

Specifications of UPD78F0500MC-5A4-A

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

78K0/Kx2
10.5 Cautions for Watch Timer
setting bits 0 (WTM0) and 1 (WTM1) of WTM to 1), the interval until the first interrupt request signal (INTWT) is generated
after the register is set does not exactly match the specification made with bits 2 and 3 (WTM2, WTM3) of WTM.
Subsequently, however, the INTWT signal is generated at the specified intervals.
R01UH0008EJ0401 Rev.4.01
Jul 15, 2010
Remark
When operation of the watch timer and 5-bit counter is enabled by the watch timer mode control register (WTM) (by
It takes 0.515625 seconds for the first INTWT to be generated (2
INTWT is then generated every 0.5 seconds.
Count clock
Watch timer
interrupt INTWT
Interval timer
interrupt INTWTI
f
Figures in parentheses are for operation with f
W
Figure 10-4. Example of Generation of Watch Timer Interrupt Request Signal (INTWT)
: Watch timer clock frequency
5-bit counter
WTM0, WTM1
Figure 10-3. Operation Timing of Watch Timer/Interval Timer
INTWT
Start
0H
Interrupt time of watch timer (0.5 s)
Interval time
(When Interrupt Period = 0.5 s)
(T)
0.515625 s
W
= 32.768 kHz (WTM7 = 1, WTM3, WTM2 = 0, 0)
0.5 s
9
× 1/32768 = 0.015625 s longer).
Overflow
Interrupt time of watch timer (0.5 s)
T
0.5 s
CHAPTER 10 WATCH TIMER
Overflow
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