tmp89fm42a TOSHIBA Semiconductor CORPORATION, tmp89fm42a Datasheet - Page 41
tmp89fm42a
Manufacturer Part Number
tmp89fm42a
Description
8 Bit Microcontroller
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TMP89FM42A.pdf
(431 pages)
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Part Number:
tmp89fm42aUG
Manufacturer:
TOSHIBA/东芝
Quantity:
20 000
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2.3
System clock controller
RA000
PINTWUC:
Example: Setting ports P00 and P01 as oscillation pins and switching the high-frequency reference clock from fosc to fc
LD
LD
SET
SET
SET
:
SET
NOP
NOP
CLR
RETI
(warm-up time: approx. 300 μs at fc = 8 MHz)
(WUCCR), 0y00000001
(WUCDR), 0x26
(EIRL).4
(P0FC).0
(SYSCR2). 6
:
(SYSCR1). 3
(SYSCR2). 7
Page 22
;WUCCR<WUCDIV>←"00" (No division)
;WUCCR<WUCSEL>←"01" (Selects fc as the source clock)
;Sets the warm-up time
;(Determine the time depending on the oscillator characteristics)
;300μs / 8 μs =37.5 round up to 0x26
;Enables INTWUC interrupts
;P0FC0←"1" (Set P00 and P01 as oscillation pins)
;SYSCR2<XTEN>←"1"
;(Starts the external high-frequency clock oscillation and starts the
;warm-up counter)
;SYSCR1<OSCSEL>←"1"
;(Switches the high-frequency reference clock from fosc to fc)
;Waits for 2 machine cycles
;Waits for 2 machine cycles
;SYSCR2<OSCEN>←"0" (Stops fosc)
TMP89FM42A
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