TMP47C990E TOSHIBA [Toshiba Semiconductor], TMP47C990E Datasheet - Page 12

• Manufacturer Part Number: TMP47C990E
• Description: CMOS 4-bit Microcontroller
• Manufacturer: TOSHIBA [Toshiba Semiconductor]

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2.7. System Controller
2.7.1 Clock Generator
The clock generator provides the basic clock pulse (CP) by
which the system clock to be supplied to the CPU and the
peripheral hardware is produced. The CP can be easily
obtained by connecting the resonator to the XIN and XOUT
Note: Accurate adjustment of the oscillation frequency.
Although the hardware to externally and directly monitor the CP is
not provided, the oscillation frequency can be adjusted by making
the program to output the pulse with a fixed frequency to the port
with the all interrupts disabled and timer/counters stopped and mon-
General flag (GF)
This is a 1-bit general-purpose flag which can be set,
cleared, or tested by program.
Figure 2-14. Clock Generator and Timing Generator
Figure 2-15. Examples of Oscillator Connection
pins. (RC oscillation is also possible, depending on the mask
option) The clock from the external oscillator is also available.
In the hold operating mode, the clock generator stops oscillat-
ing.
Example: To output the oscillation frequency adjusting moni-
itoring this pulse. With a system requiring the oscillation frequency
adjustment the adjusting program must be created beforehand.
Example:
tor pulse to port R40.
cuted with the accumulator, H register, L
register, data memory (address 07H), and
carry flag being set to “C
and “1” respectively, the contents of the
accumulator and flags become as follows:
When the following instruction are exe-
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H
”, “0”, “7”, “5”,