TMP86C909XB Toshiba, TMP86C909XB Datasheet - Page 37

• Manufacturer Part Number: TMP86C909XB
• Description: EMULATION CHIP FOR TMP86F SDIP
• Manufacturer: Toshiba

Specifications of TMP86C909XB

• Accessory Type: Adapter
• For Use With/related Products: TMP86F SDIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.2 System Clock Controller
2.2.4.4
Example 1 :Switching from NORMAL2 mode to SLOW1 mode.
Example 2 :Switching to the SLOW1 mode after low-frequency clock has stabilized.
PINTTC4:
VINTTC4:
SLOW mode
(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.
SLOW2 mode. Next, clear SYSCR2<XEN> to turn off high-frequency oscillation.
Switching from NORMAL2 mode to SLOW1 mode
First, set SYSCR2<SYSCK> to switch the main system clock to the low-frequency clock for
Note: The high-frequency clock can be continued oscillation in order to return to NORMAL2 mode from
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). 3
(TC4CR). 3
(TC4CR). 3
(SYSCR2). 5
(SYSCR2). 7
PINTTC4
Page 26
; SYSCR2<SYSCK>
; SYSCR2<XEN>
; SYSCR2<XTEN>
; Sets warm-up time (Depend on oscillator accompanied)
; IMF
; Enables INTTC4
; IMF
; Starts TC4, 3
; Stops TC4, 3
; SYSCR2<SYSCK>
; SYSCR2<XEN>
; Sets mode for TC4, 3 (16-bit mode, fs for source)
; Sets warming-up counter mode
; INTTC4 vector table
(Switches the main system clock to the low-frequency
clock for SLOW2)
(Turns off high-frequency oscillation)
(Switches the main system clock to the low-frequency clock)
(Turns off high-frequency oscillation)
←
←
0
1
←
←
←
←
←
0
0
1
1
1
TMP86F409NG