UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 538

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

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

(1) Oscillation stabilization time counter status register (OSTC)
538
This is the register that indicates the count status of the X1 clock oscillation stabilization time counter. When X1
clock oscillation starts with the internal high-speed oscillation clock or subsystem clock used as the CPU clock,
the X1 clock oscillation stabilization time can be checked.
OSTC can be read by a 1-bit or 8-bit memory manipulation instruction.
When reset is released (reset by RESET input, POC, LVI and WDT), the STOP instruction and MSTOP (bit 7 of
MOC register) = 1 clear OSTC to 00H.
Address: FFA3H
Symbol
OSTC
Cautions 1. After the above time has elapsed, the bits are set to 1 in order from MOST11 and
Remark
Figure 18-1. Format of Oscillation Stabilization Time Counter Status Register (OSTC)
MOST
11
1
1
1
1
1
2. The oscillation stabilization time counter counts up to the oscillation stabilization time
3. The X1 clock oscillation stabilization time does not include the time until clock
f
X
7
0
: X1 clock oscillation frequency
After reset: 00H
MOST
remain 1.
set by OSTS. If the STOP mode is entered and then released while the internal high-
speed oscillation clock is being used as the CPU clock, set the oscillation stabilization
time as follows.
• Desired OSTC oscillation stabilization time ≤ Oscillation stabilization time set by
Note, therefore, that only the status up to the oscillation stabilization time set by OSTS
is set to OSTC after STOP mode is released.
oscillation starts (“a” below).
13
0
1
1
1
1
OSTS
MOST
14
0
0
1
1
1
6
0
X1 pin voltage
waveform
MOST
15
CHAPTER 18 STANDBY FUNCTION
0
0
0
1
1
R
User’s Manual U17554EJ4V0UD
MOST
5
0
STOP mode release
16
0
0
0
0
1
2
2
2
2
2
MOST11
11
13
14
15
16
/f
/f
/f
/f
/f
X
X
X
X
X
4
a
min.
min.
min.
min.
min.
512
2.05 ms min.
4.10 ms min. 3.27 ms min.
8.19 ms min. 6.55 ms min.
16.38 ms min. 13.11 ms min. 6.55 ms min. 3.27 ms min.
f
X
MOST13
= 4 MHz
Oscillation stabilization time status
μ
s min.
3
409.6
1.64 ms min.
f
X
MOST14
= 5 MHz
μ
2
s min. 204.8
f
819.2
1.64 ms min. 819.2
3.27 ms min. 1.64 ms min.
X
MOST15
= 10 MHz
1
μ
μ
s min. 102.4
s min. 409.6
f
X
MOST16
= 20 MHz
0
μ
μ
μ
s min.
s min.
s min.