OSCILLATOR CIRCUITS
KS57C2308/P2308/C2316/P2316
6-6
+
+
PROGRAMMING TIP — Setting the CPU Clock
To set the CPU clock to 0.95 µs at 4.19 MHz:
BITS
EMB
SMB
15
LD
A,#3H
LD
PCON,A
INSTRUCTION CYCLE TIMES
The unit of time that equals one machine cycle varies depending on whether the main system clock (fx) or a
subsystem clock (fxt) is used, and on how the oscillator clock signal is divided (by 4, 8, or 64). Table 6-2 shows
corresponding cycle times in microseconds.
Table 6-2. Instruction Cycle Times for CPU Clock Rates
Oscillation
Source
Selected
CPU Clock
Resulting
Frequency
Cycle Time (µs)
fx = 4.19 MHz
fx/64
65.5 kHz
15.3
fx/8
524.0 kHz
1.91
fx/4
1.05 MHz
0.95
fxt = 32.768 kHz
fxt/4
8.19 kHz
122.0
Summary of Contents for KS57C2308
Page 30: ...ADDRESS SPACES KS57C2308 P2308 C2316 P2316 2 22 NOTES ...
Page 168: ...SAM47 INSTRUCTION SET KS57C2308 P2308 C2316 P2316 5 94 NOTES ...
Page 170: ......
Page 206: ...POWER DOWN KS57C2308 P2308 C2316 P2316 8 8 NOTES ...
Page 210: ...RESET KS57C2308 P2308 C2316 P2316 9 4 NOTES ...
Page 222: ...I O PORTS KS57C2308 P2308 C2316 P2316 10 12 NOTES ...
Page 272: ...LCD CONTROLLER DRIVER KS57C2308 P2308 C2316 P2316 12 24 NOTES ...
Page 280: ...SERIAL I O INTERFACE KS57C2308 P2308 C2316 P2316 13 8 NOTES ...
Page 294: ...MECHANICAL DATA KS57C2308 P2308 C2316 P2316 15 2 NOTES ...
Page 310: ...KS57P2308 P2316 OTP KS57C2308 P2308 C2316 P2316 16 16 NOTES ...
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