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UPD17231 Datasheet(PDF) 38 Page - Renesas Technology Corp

Part # UPD17231
Description  MOS INTEGRATED CIRCUIT
PDF  94 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17231 Datasheet(HTML) 38 Page - Renesas Technology Corp

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Data Sheet U14360EJ1V0DS00
µPD17230, 17231, 17232, 17233, 17234, 17235, 17236
36
4.
CLOCK GENERATOR CIRCUIT
4.1
Instruction Execution Time (CPU Clock) Selection
The
µPD17236 is equipped with a clock oscillator that supplies clocks to the CPU and hardware peripherals.
Instruction execution time can be changed in two steps (ordinary mode and high-speed mode) without changing the
oscillation frequency.
To change the instruction execution time, change the mode of SYSCK (RF: address 02H) of the register file by
using the POKE instruction.
Note, that the mode is actually only changed when the instruction next to the POKE instruction has been executed.
When using the high-speed mode, pay attention to the supply voltage. (Refer to 13. ELECTRICAL SPECIFICA-
TIONS.)
On reset, the ordinary mode is set.
32
10
0
0
0
SYSCK
Address
RF : 02H
SYSCK
On reset
0H
R/W
R/W
0
1
Selects Instruction Execution Time
Ordinary mode 32/fX (8 s)
µ
High-speed mode 16/fX (4 s)
µ
Figures in ( ): indicate figures when system clock fX = 4 MHz.



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