OSCILLATOR CIRCUITS
KS57C2308/P2308/C2316/P2316
6-12
CLOCK OUTPUT MODE REGISTER (CLMOD)
The clock output mode register, CLMOD, is a 4-bit register that is used to enable or disable clock output to the
CLO pin and to select the CPU clock source and frequency. CLMOD is addressable by 4-bit write instructions
only.
FD0H
CLMOD.3
"0"
CLMOD.1
CLMOD.0
CLMOD
RESET
clears CLMOD to logic zero, which automatically selects the CPU clock as the clock source (without
initiating clock oscillation), and disables clock output.
CLMOD.3 is the enable/disable clock output control bit; CLMOD.1 and CLMOD.0 are used to select one of four
possible clock sources and frequencies: normal CPU clock, fxx/8, fxx/16, or fxx/64.
Table 6-7. Clock Output Mode Register (CLMOD) Organization
CLMOD Bit Settings
Resulting Clock Output
CLMOD.1
CLMOD.0
Clock Source
Frequency
0
0
CPU clock (fx/4, fx/8, fx/64, fxt/4)
1.05 MHz, 524 kHz, 65.5 kHz
0
1
fxx/8
524 kHz
1
0
fxx/16
262 kHz
1
1
fxx/64
65.5 kHz
CLMOD.3
Result of CLMOD.3 Setting
0
Clock output is disabled
1
Clock output is enabled
NOTE
: Assumes that fxx = 4.19 MHz.
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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