SMBP2501BPB datasheet(55/107 Pages) SONIX

55 / 107 page

SN8P2501B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 55

Version 2.1

5.2 NORMAL MODE

The Normal Mode is system high clock operating mode. The system clock source is from high speed oscillator. The

program is executed. After power on and any reset trigger released, the system inserts into normal mode to execute

program. When the system is wake-up from power down mode, the system also inserts into normal mode. In normal

mode, the high speed oscillator actives, and the power consumption is largest of all operating modes.



The program is executed, and full functions are controllable.



The system rate is high speed.



The high speed oscillator and internal low speed RC type oscillator active.



Normal mode can be switched to other operating modes through OSCM register.



Power down mode is wake-up to normal mode.



Slow mode is switched to normal mode.



Green mode from normal mode is wake-up to normal mode.

5.3 SLOW MODE

The slow mode is system low clock operating mode. The system clock source is from internal low speed RC type

oscillator (16KHz @3V, 32KHz @5V). The slow mode is controlled by CLKMD bit of OSCM register. When CLKMD=0,

the system is in normal mode. When CLKMD=1, the system inserts into slow mode. The high speed oscillator

won’t be

disabled automatically after switching to slow mode, and must be disabled by SPTHX bit to reduce power consumption.

In slow mode, the system rate is fixed Flosc/4 (Flosc is internal low speed RC type oscillator frequency).



The program is executed, and full functions are controllable.



The system rate is low speed (Flosc/4).



The internal low speed RC type oscillator actives, and the high speed oscillator is controlled by STPHX=1. In slow

mode, to stop high speed oscillator is strongly recommendation.



Slow mode can be switched to other operating modes through OSCM register.



Power down mode from slow mode is wake-up to normal mode.



Normal mode is switched to slow mode.



Green mode from slow mode is wake-up to slow mode.

5.4 POWER DOWN MDOE

The power down mode is the system ideal status. No program execution and oscillator operation. Whole chip is under

low power consumption status under 1uA. The power down mode is waked up by P0, P1 hardware level change trigger.

P1 wake-up function is controlled by P1W register. Any operating modes into power down mode, the system is waked

up to normal mode. Inserting power down mode is controlled by CPUM0 bit of OSCM register. W hen CPUM0=1, the

system inserts into power down mode. After system wake-up from power down mode, the CPUM0 bit is disabled (zero

status) automatically.



The program stops executing, and full functions are disabled.



All oscillators including external high speed oscillator, internal high speed oscillator and internal low speed

oscillator stop.



The power consumption is under 1uA.



The system inserts into normal mode after wake-up from power down mode.



The power down mode wake-up source is P0 and P1 level change trigger.



Note: If the system is in normal mode, to set STPHX=1 to disable the high clock oscillator. The system is

under no system clock condition. This condition makes the system stay as power down mode, and can

be wake-up by P0, P1 level change trigger.

SMBP2501BPB Datasheet(PDF) 55 Page - SONiX Technology Company

SMBP2501BPB Datasheet(HTML) 55 Page - SONiX Technology Company

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL