Pin #

Function

Description

1

GPIO0/P0.0/RX0/PWM0

GPIO line 0 (P0.0). RX, W1 input, and DATA input of serial port 0.

2

GPIO1/P0.1/TX0/PWM1

GPIO line 1 (P0.1). TX, W1 output, and DATA output of serial port 0. REDUCED LOADING ABILITY.

3

GPIO2/P0.2/INT0/PWM2

GPIO line 2 (P0.2). Interrupt line 0.

4

GPIO3/P0.3/INT1/PWM3

GPIO line 3 (P0.3). Interrupt line 1.  REDUCED LOADING ABILITY.

5

GPIO4/P0.4/ADC0/PWM4

GPIO line 4 (P0.4). ADC channel 0.

6

GPIO5/P0.5/ADC1/PWM5

GPIO line 5 (P0.5). ADC channel 1.

7

GPIO6/P0.6/ADC2/PWM6

GPIO line 6 (P0.6). ADC channel 2.

8

GPIO7/P0.7/RX1/PWM7

GPIO line 7 (P0.7). RX, W1 input, and DATA input of serial port 1 or RX line of the serial debug port.

9

GPIO8/P1.0/TX1/PWM8

GPIO line 8 (P1.0). TX, W1 output, and DATA output of serial port 1 or TX line of the serial debug port. Also a square-wave output controlled by the beep. object.

10

<Reserved>

Flash memory SPI bus. Reserved for future development. Leave this pin unconnected.

11

<Reserved>

Flash memory SPI bus. Reserved for future development. Leave this pin unconnected.

12

GND

System ground.

13

<Reserved>

Flash memory SPI bus. Reserved for future development. Leave this pin unconnected.

14

<Reserved>

Flash memory SPI bus. Reserved for future development. Leave this pin unconnected.

15

GPIO9/P1.1

GPIO line 9 (P1.1).

16

HM

Hardware monitor activation line.

17

MD

Mode selection pin.

18

SY

Yellow status LED control line.

19

SG

Green status LED control line.

20

SR

Red status LED control line.

21

RST

Reset line, active LOW.

22

LP

Low-power mode output. When LOW, indicates that the WM2000 is in the low-power (shutdown) mode.

23

VCCB

RTC power line. For normal module operation, RTC power must be connected at all times. If there's no backup battery, tie VCCB to VCC. The backup power input draws power even when the module is active.

24

VCC

Main power input, 3.3V nominal, ±5%, max. average current consumption of 150mA. Occasional current bursts up to 500mA.