tmp19a43fzxbg TOSHIBA Semiconductor CORPORATION, tmp19a43fzxbg Datasheet - Page 26

• Manufacturer Part Number: tmp19a43fzxbg
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

EICRCG
(0xFFFF_EE20) Read/Write
Note : To clear any of the eight interrupt sources which are used for terminating a standby mode:
3.3.3
(1) For KWUP, use KWUPCLR.
(2) For extended interrupts INTB/INTC/INTD/INTE, use INTFLG.
(3) For INT0 to INT4 and INTRTC, perform the clearing operation twice, first in the CG block and
(4) For all other interrupt sources, use the INTC block.
(3) Interrupt request clear register
then in the INTC block.
System clock control unit
GEAR1:0 = 11; the system clock fsys is set to fc/8 (= fc × 1/8). (Since the PLL multiplies the original
oscillation frequency by 4, fc equals to fosc × 4, where fosc is the original oscillation frequency.) For
example, if the X1 and X2 pins are connected to an 8-MHz resonator, a reset will set fsys to 4 MHz (= 8
MHz × 4 × 1/8).
However, since SYSCR1<DFOSC> is initialized to 0 by a reset (so that fc = fosc × 1/2), if the X1 and X2
pins are connected to a 25-MHz resonator, fsys will be 1.25 MHz. Also, if the device is clocked by an
external oscillator and no internal resonator is connected, fc = fosc can be selected by setting
SYSCR1<DFOCS> to 1 after a reset, so that the system clock frequency fsys is twice the frequency
obtained with an internal resonator.
(1) Oscillation settling time (switchover between NORMAL and SLOW modes)
Bit Symbol
After reset
Function
PLLOFF pin Low. In this case, too, the system clock fsys will be set to fc/8 (= fc × 1/8) by a reset.
When reset, the device enters single-clock mode with the result that XEN = 1, XTEN = 0 and
To disable the system from using a PLL-multiplied clock as the system clock by default, drive the
timer to check whether resonator oscillation has settled. The warm-up time can be set to suit the
characteristics of the resonator using SYSCR2<WUPT1:WUPT0>. The value of SYSCR0<WUEF>
must be checked in software (using instructions) to determine the start and completion of the
warm-up time.
If a resonator is connected to the resonator-connecting pins, the device uses the built-in warm-up
Table 3.3.1 shows warm-up times for mode switching.
⎯
⎯
7
⎯
⎯
6
TMP1942CY/CZ-25
⎯
5
1
⎯
4
0
⎯
⎯
3
Clear interrupt request
000: INT0
001: INT1
010: INT2
011: INT3
TMP1942CY/CZ
ICRCG2
⎯
2
100: INT4
101:KWUP
110: INTB/C/D/E
111: INTRTC
ICRCG1
⎯
W
1
ICRCG0
⎯
0