TMP86C993XB Toshiba, TMP86C993XB Datasheet - Page 41
TMP86C993XB
Manufacturer Part Number
TMP86C993XB
Description
EMULATION CHIP FOR TMP86F SSOP
Manufacturer
Toshiba
Datasheet
1.TMP86C993XB.pdf
(246 pages)
Specifications of TMP86C993XB
Accessory Type
Adapter
For Use With/related Products
TMP86F SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Example 1 :Switching from NORMAL2 mode to SLOW1 mode.
Example 2 :Switching to the SLOW1 mode after low-frequency clock has stabilized.
2.2.4.4
PINTTC4:
VINTTC4:
(1)
SLOW mode is controlled by the system control register 2 (SYSCR2).
The following is the methods to switch the mode with the warm-up counter.
SLOW mode
mode. Next, clear SYSCR2<XEN> to turn off high-frequency oscillation.
forming the above operations. The timer/counter (TC4,TC3) can conveniently be used to confirm that
low-frequency clock oscillation has stabilized.
First, set SYSCR2<SYSCK> to switch the main system clock to the low-frequency clock for SLOW2
Note:The high-frequency clock can be continued oscillation in order to return to NORMAL2 mode from
Switching from NORMAL2 mode to SLOW1 mode
When the low-frequency clock oscillation is unstable, wait until oscillation stabilizes before per-
SET
CLR
SET
LD
LD
LDW
DI
SET
EI
SET
:
CLR
SET
CLR
RETI
:
DW
SLOW mode quickly. Always turn off oscillation of high-frequency clock when switching from
SLOW mode to stop mode.
(SYSCR2). 5
(SYSCR2). 7
(SYSCR2). 6
(TC3CR), 43H
(TC4CR), 05H
(TTREG3), 8000H
(EIRH). 7
(TC4CR). 3
(TC4CR). 3
(SYSCR2). 5
(SYSCR2). 7
PINTTC4
Page 27
; SYSCR2<SYSCK> ← 1
; (Switches the main system clock to the low-frequency clock for SLOW2)
; SYSCR2<XEN> ← 0
; (Turns off high-frequency oscillation)
; SYSCR2<XTEN> ← 1
; Sets mode for TC4, 3 (16-bit mode, fs for source)
; Sets warming-up counter mode
; Sets warm-up time (Depend on oscillator accompanied)
; IMF ← 0
; Enables INTTC4
; IMF ← 1
; Starts TC4, 3
; Stops TC4, 3
; SYSCR2<SYSCK> ← 1
; (Switches the main system clock to the low-frequency clock)
; SYSCR2<XEN> ← 0
; (Turns off high-frequency oscillation)
; INTTC4 vector table
TMP86FH92DMG
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