TMP47C990E TOSHIBA [Toshiba Semiconductor], TMP47C990E Datasheet - Page 13

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

TOSHIBA CORPORATION
2.7.2 Timing Generator
The timing generator produces the system clocks from basic
clock pulse (CP) which are supplied to the SPU and the
peripheral hardware.
The timing generator provides the following functions:
counters
operating mode
Generation of an internal source clock for interval timer
Generation of an internal source clock for timer/
Generation of a warm-up time for releasing of the hold
Figure 2-16. Configuration of Interval Timer
Figure 2-17. Instruction Cycle
counter with a divided-by-16 prescaler. The basic clock (fre-
quency: fc) provides the timing generator. Therefore, the out-
put frequency at the last stage is fc/2
binary counter is cleared to “0”, however, the prescaler is not
cleared.
2.7.3 Instruction Cycle
The instruction execution and the on-chip peripheral hardware
operations are performed in synchronization with the basic
clock pulse (CP: fx [Hx]). The smallest unit of instruction execu-
tion is called an instruction cycle. The instruction set of the
TLCS-47 series consists of 1-cycle instructions and 2-cycle
instructions. The former requires 1 cycle for their execution;
the latter, 2 cycles. Each instruction cycle consists of 4 states
(S1 through S4). Each state consists of 2 basic clock pulses.
The timing generator consists of a 18-stage binary
22
[Hz]. During reset, the
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