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5. Power down wake-up register: WAKE_CLKO (Non bit-Addressable)

SFR name

Address bit

WAKE_CLKO

8FH name PCAWAKEUP RXD_PIN_IE T1_PIN_IE T0_PIN_IE

T1CKLO T0CKLO

PCAWAKEUP: When set and the associated-PCA interrupt control registers is configured correctly, the CEXn pin

of PCA function is enabled to wake up MCU from power-down state.

RXD_PIN_IE: When set and the associated-UART interrupt control registers is configured correctly, the RXD

pin (P3.0) is enabled to wake up MCU from power-down state.

T1_PIN_IE :

When set and the associated-Timer1 interrupt control registers is configured correctly, the T1 pin

(P3.5) is enabled to wake up MCU from power-down state.

T0_PIN_IE :

When set and the associated-Timer0 interrupt control registers is configured correctly, the T1 pin

(P3.4) is enabled to wake up MCU from power-down state.

T1CKLO :

When set, P3.5 is enabled to be the clock output of Timer 1. The clock rate is Timer 1overflow rate

divided by 2.

T0CKLO :

When set, P3.4 is enabled to be the clock output of Timer 0. The clock rate is Timer 0overflow rate

divided by 2.

4. Slave Address Control registers SADEN and SADDR

SADEN: Slave Address Mask register

SADDR: Slave Address register

SADDR register is combined with SADEN register to form Given/Broadcast Address for automatic address

recognition. In fact, SADEN function as the "mask" register for SADDR register. The following is the example

for it.

SADDR

= 1100 0000

SADEN

= 1111 1101

Given

= 1100 00x0

The Given slave address will be checked except bit 1 is

treated as "don't care".

The Broadcast Address for each slave is created by taking the logical OR of SADDR and SADEN. Zero in this

result is considered as "don't care" and a Broad cast Address of all " don't care". This disables the automatic

address detection feature.

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STC12LE5616AD Datasheet(PDF) 198 Page - STCmicro Technology Co,.Ltd