UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 269
![8BIT MCU, 128K FLASH, 7K RAM, LQFP](/photos/19/1/190186/ge64lqfp05-40_sml.jpg)
UPD78F0890GK(A)-GAJ-AX
Manufacturer Part Number
UPD78F0890GK(A)-GAJ-AX
Description
8BIT MCU, 128K FLASH, 7K RAM, LQFP
Manufacturer
NEC
Datasheet
1.UPD78F0890GKA-GAJ-AX.pdf
(732 pages)
Specifications of UPD78F0890GK(A)-GAJ-AX
Controller Family/series
UPD78F
No. Of I/o's
55
Ram Memory Size
7KB
Cpu Speed
20MHz
No. Of Timers
10
No. Of Pwm
RoHS Compliant
Core Size
8bit
Program Memory Size
128KB
Oscillator Type
External, Internal
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10.4 Watch Timer Operations
10.4.1 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
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.
0
0
1
1
WTM2
2. f
3. f
0
1
0
1
W
PRS
SUB
:
Interrupt Time
2
2
2
2
: Peripheral hardware clock frequency
: Subsystem clock frequency
14
13
5
4
/f
/f
Watch timer clock frequency (f
Selection
/f
/f
W
W
W
W
When Operated at
f
0.5 s
0.25 s
977
488
SUB
(WTM7 = 1)
= 32.768 kHz
μ
μ
s
s
Table 10-4. Watch Timer Interrupt Time
CHAPTER 10 WATCH TIMER
User’s Manual U17554EJ4V0UD
When Operated at
0.53 s
0.26 s
1.03 ms
0.51 ms
PRS
f
(WTM7 = 0)
PRS
/2
7
= 4 MHz
or f
SUB
)
When Operated at
0.419 s
0.210 s
819
410
f
(WTM7 = 0)
PRS
μ
μ
s
s
= 5 MHz
When Operated at
0.210 s
0.105 s
410
205
f
PRS
(WTM7 = 0)
μ
μ
s
s
= 10 MHz
When Operated at
0.105 s
52.5 ms
205
102
f
PRS
(WTM7 = 0)
μ
μ
= 20 MHz
s
s
9
× 1/f
269
W
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