TC9028AF 데이터 시트보기 (PDF) - Toshiba
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TC9028AF Datasheet PDF : 21 Pages
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2.9 Flags (FLAG)
There are two types of flags: carry flag (CF) and status flag (SF).
These are set and cleared according to conditions specified by instructions.
The status flag is initialized to 1 at reset.
2.10 Clock generator, Timing generator
Figure 2.6 shows the clock generator and timing generator configuration.
XT 3
XT 2
Clock
gnenrator
CP Timing generator
TC9028AP/AF
HOLD control
System clock
Figure 2.6 Clock generator and timing generator
2.10.1 Clock generator
The clock generator is a circuit which generates the fundamental clock pulse (CP) as the
basis for the system clock supplied to the CPU. The fundamental clock is easily established by
connecting the oscillator to the XT and XT pins. A clock can also be input from an external
oscillator.
Clock input to the XT pin is used as the fundamental clock.
The clock generator stops oscillation during hold mode.
XT
XT
2
3
XT
XT
2
3
(open)
(a) Ceramic oscillator
(b) External oscillator
Figure 2.7 Typical oscillator connections
2.10.2 Timing generator
The timing generator is a circuit which uses the fundamental clock to generate various system
clocks for the CPU and peripheral hardware.
7
2002-04-19
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