UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 132

• 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

(4) Main OSC control register (MOC)
132
This register selects the operation mode of the high-speed system clock.
This register is used to stop the X1 oscillator or to disable an external clock input from the EXCLK pin when the
CPU operates with a clock other than the high-speed system clock.
MOC can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets this register to 80H.
Address: FFA2H
Symbol
MOC
Cautions 1. When setting MSTOP to 1, be sure to confirm that the CPU operates with a clock
MSTOP
MSTOP
<7>
0
1
After reset: 80H
2. Do not clear MSTOP to 0 while bit 6 (OSCSEL) of the clock operation mode select
3. The peripheral hardware cannot operate when the peripheral hardware clock is
Figure 6-5. Format of Main OSC Control Register (MOC)
X1 oscillator operating
X1 oscillator stopped
other than the high-speed system clock. Specifically, set MSTOP to 1 under
either of the following conditions.
• When MCS = 0 (when CPU operates with the internal high-speed oscillation
• When CLS = 1 (when CPU operates with the subsystem clock)
In addition, stop peripheral hardware that is operating on the high-speed system
clock before setting MSTOP to 1.
register (OSCCTL) is 0.
stopped. To resume the operation of the peripheral hardware after the peripheral
hardware clock has been stopped, initialize the peripheral hardware.
6
0
clock)
R/W
X1 oscillation mode
CHAPTER 6 CLOCK GENERATOR
User’s Manual U17554EJ4V0UD
5
0
Control of high-speed system clock operation
4
0
3
0
External clock from EXCLK pin is enabled
External clock from EXCLK pin is disabled
External clock input mode
2
0
1
0
0
0