C8051F360 datasheet(104/288 Pages) SILABS

104 / 288 page

C8051F360/1/2/3/4/5/6/7/8/9

104

Rev. 1.0

SFR Definition 9.9. ACC: Accumulator

Bits 7–0: ACC: Accumulator.

This register is the accumulator for arithmetic operations.

SFR Page:

SFR Address:

all pages

0xE0

(bit addressable)

R/W

Reset Value

ACC.7

ACC.6

ACC.5

ACC.4

ACC.3

ACC.2

ACC.1

ACC.0

00000000

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

SFR Definition 9.10. B: B Register

Bits 7–0: B: B Register.

This register serves as a second accumulator for certain arithmetic operations.

SFR Page:

SFR Address:

all pages

0xF0

(bit addressable)

R/W

Reset Value

B.7

B.6

B.5

B.4

B.3

B.2

B.1

B.0

00000000

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

9.5.

Power Management Modes

The CIP-51 core has two software programmable power management modes: Idle and Stop. Idle mode

halts the CPU while leaving the external peripherals and internal clocks active. In Stop mode, the CPU is

halted, all interrupts and timers (except the Missing Clock Detector) are inactive, and the system clock is

stopped. Since clocks are running in Idle mode, power consumption is dependent upon the system clock

frequency and the number of peripherals left in active mode before entering Idle. Stop mode consumes the

least power. SFR Definition 9.11 describes the Power Control Register (PCON) used to control the CIP-

51's power management modes.

Although the CIP-51 has Idle and Stop modes built in (as with any standard 8051 architecture), power

management of the entire MCU is better accomplished by enabling/disabling individual peripherals as

needed. Each analog peripheral can be disabled when not in use and put into low power mode. Digital

peripherals, such as timers or serial buses, draw little power whenever they are not in use. Turning off the

Flash memory saves power, similar to entering Idle mode. Turning off the oscillator saves even more

power, but requires a reset to restart the MCU.

The C8051F36x devices feature an additional low-power SUSPEND mode, which stops the internal oscil-

lator until an awakening event occurs. See Section “16.1.1. Internal Oscillator Suspend Mode” on

page 170 for more information.

C8051F360 Datasheet(PDF) 104 Page - Silicon Laboratories

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