UPD78F0386GK-8EU-A Renesas Electronics America, UPD78F0386GK-8EU-A Datasheet - Page 241

• Manufacturer Part Number: UPD78F0386GK-8EU-A
• Description: MCU 96KB FLASH 5KB RAM
• Manufacturer: Renesas Electronics America
• Series: 78K0/Lx2r

Specifications of UPD78F0386GK-8EU-A

• Core Processor: 78K/0
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: 3-Wire SIO, I²C, LIN, UART/USART
• Peripherals: LCD, LVD, POR, PWM, WDT
• Number Of I /o: 26
• Program Memory Size: 96KB (96K x 8)
• Program Memory Type: FLASH
• Ram Size: 5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

9.4 Watch Timer Operations
9.4.1 Watch timer operation
hardware clock or subsystem clock.
operation starts. When these bits are cleared to 0, the 5-bit counter is cleared and the count operation stops.
clearing WTM1 to 0. In this case, however, the 11-bit prescaler is not cleared. Therefore, an error up to 2
seconds occurs in the first overflow (INTWT) after zero-second start.
Remarks 1. f
9.4.2 Interval timer operation
interval of the preset count value.
(WTM).
stops.
Remarks 1. f
WTM6
WTM3
The watch timer generates an interrupt request signal (INTWT) at a specific time interval by using the peripheral
When bit 0 (WTM0) and bit 1 (WTM1) of the watch timer operation mode register (WTM) are set to 1, the count
When the interval timer is simultaneously operated, zero-second start can be achieved only for the watch timer by
The interrupt request is generated at the following time intervals.
The watch timer operates as interval timer which generates interrupt request signals (INTWTI) repeatedly at an
The interval time can be selected with bits 4 to 6 (WTM4 to WTM6) of the watch timer operation mode register
When bit 0 (WTM0) of the WTM is set to 1, the count operation starts. When this bit is set to 0, the count operation
0
0
0
0
1
1
1
1
0
0
1
1
WTM5
WTM2
2. f
3. f
2. f
3. f
0
0
1
1
0
0
1
1
0
1
0
1
W
PRS
SUB
W
PRS
SUB
:
:
WTM4
Interrupt Time
2
2
2
2
: Peripheral hardware clock frequency
: Subsystem clock frequency
: Peripheral hardware clock frequency
: Subsystem clock frequency
14
13
5
4
/f
/f
Watch timer clock frequency (f
Watch timer clock frequency (f
Selection
0
1
0
1
0
1
0
1
/f
/f
W
W
W
W
2
2
2
2
2
2
2
2
Interval Time
4
5
6
7
8
9
10
11
/f
/f
/f
/f
/f
/f
/f
/f
W
W
W
W
W
W
W
W
When Operated at
f
0.5 s
0.25 s
977 s
488 s
SUB
(WTM7 = 1)
= 32.768 kHz
Table 9-4. Watch Timer Interrupt Time
Table 9-5. Interval Timer Interval Time
kHz (WTM7 = 1)
When Operated
488 s
977 s
1.95 ms
3.91 ms
7.81 ms
15.6 ms
31.3 ms
62.5 ms
at f
SUB
CHAPTER 9 WATCH TIMER
User’s Manual U17504EJ2V0UD
= 32.768
When Operated at
1.05 s
0.52 s
2.05 ms
1.02 ms
PRS
PRS
f
(WTM7 = 0)
PRS
/2
/2
7
7
= 2 MHz
or f
or f
When Operated
1.02 ms
2.05 ms
4.10 ms
8.20 ms
16.4 ms
32.8 ms
65.5 ms
131.1 ms
at f
(WTM7 = 0)
SUB
PRS
SUB
)
= 2 MHz
)
When Operated at
0.419 s
0.210 s
819 s
410 s
f
(WTM7 = 0)
PRS
When Operated
410 s
820 s
1.64 ms
3.28 ms
6.55 ms
13.1 ms
26.2 ms
52.4 ms
at f
= 5 MHz
(WTM7 = 0)
PRS
= 5 MHz
When Operated at
0.210 s
0.105 s
410 s
205 s
f
PRS
(WTM7 = 0)
at f
When Operated
205 s
410 s
820 s
1.64 ms
3.28 ms
6.55 ms
13.1 ms
26.2 ms
(WTM7 = 0)
= 10 MHz
PRS
= 10 MHz
When Operated at
0.105 s
52.5 ms
205 s
102 s
at f
When Operated
f
102 s
205 s
410 s
820 s
1.64 ms
3.28 ms
6.55 ms
13.1 ms
PRS
(WTM7 = 0)
(WTM7 = 0)
PRS
= 20 MHz
= 20 MHz
9
239
1/f
W