AS7000 datasheet(69/92 Pages) AMSCO

69 / 92 page

ams Datasheet

Page 69

[v1-12] 2018-Feb-26

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AS7000 − Detailed Description

Debug – SWD

Figure 87:

Program/Debug

Note(s):

1. Press debug button on power-up (VDD ON).

During power up of the AS7000 the device checks if the pin

SIGREF is shorted to GND (e.g. by a resistance of 10Ω) – see

Figure 87. If this condition is detected and the security bit is not

set, a monitor mode is entered.

In this monitor mode the AS7000 waits 5s where a debugger

can be connected. If the 10s expires without a debugger

connected, the AS7000 continues startup.

If a debugger is connected, the debugger can control AS7000

as required.

Note(s): If the security bit is set inside the EEPROM the

debugger is bypassed even if SIGREF is shorted to GND upon

startup.

AS7000

M0 CPU

+ RAM/

EEPROM

& Interfaces

GPIO 4

GPIO 3

GPIO 2

GPIO 1

GPIO 0

GPIO8

GPIO7

GPIO6

GPIO5

LDO

Ref

Optical barrier

AGND

SIGREF

VDD

V_LDO

GND

VDD

VD1

VD2

LED

Supply

VD4

VD3

LED

Supply

10kΩ

SWCLK

SWDIO

Serial

Wire

Debug

ON=0,off by software

10Ω

Press on

startup for

debug

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