MX10EXAQC 查看數據表（PDF） - Macronix International

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MX10EXAQC

XA 16-bit Microcontroller Family 64K Flash/2K RAM, Watchdog, 2UARTs

Macronix International 

Table 5. Prescaler Select Values in WDCON

PRE2

0

0

0

0

1

1

1

1

PRE1

0

0

1

1

0

0

1

1

PRED

0

1

0

1

0

1

0

1

DIVISOR

32

64

128

256

512

1024

2048

4096

MX10EXA

Watchdog Detailed Operation

When external RESET is applied, the following takes

place:

• Watchdog run control bit set to ON (1).

• Autoload register WDL set to 00 (mm. count).

• Watchdog time-out flag cleared.

• Prescaler is cleared.

• Prescaler tap set to the highest divide.

• Autoload takes place.

When coming out of a hardware reset, the software should

load the autoload register and then feed the watchdog

(cause an autoload).

If the watchdog is running and happens to underflow at

the time the external RESET is applied, the watchdog

time-out flag will be cleared.

WATCHDOG FEED SEQUENCE

MOV WFEED1,#A5H

MOV WFEED2,#5AH

TCLK

PRESCALER

WDL

8-BIT DOWN

COUNTER

INTERNAL RESET

PRE2 PRE1 PRE0

-

- WDRUN WDTOF - WDCON

Figure 14. Watchdog Timer in XA

P/N:PM0625 Specifications subject to change without notice, contact your sales representatives for the most update information. REV. 1.0, JUL. 01, 2005

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