M052LAN Nuvoton Technology Corporation of America, M052LAN Datasheet - Page 267

• Manufacturer Part Number: M052LAN
• Description: IC MCU 32BIT 8KB FLASH 48LQFP
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro M051™r

Specifications of M052LAN

• Core Processor: ARM Cortex-M0
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: EBI/EMI, I²C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, POR, PWM, WDT
• Number Of I /o: 40
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 8x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

6.9.2
6.9.3
NuMicro M051
The Watchdog Timer clock control and block diagram is shown in the Figure 6.9-2.
Note:
1. Watchdog timer resets CPU and lasts 63 WDT_CLK.
2. If user intends to use WDT to wakeup power-down mode, it is recommended
that CPU clock source is set as the same as WDT clock source before CPU
enters in power-down mode.
18-bit free running counter to avoid CPU from Watchdog timer reset before the delay time
expires.
Selectable time-out interval (2^4 ~ 2^18) and the time out interval is 86.67 us ~ 21.93 ms (if
WDT_CLK = 12 MHz).
Reset period = WDT_CLK * 63, if WDT_CLK = 12 MHz.
Features
WDT Block Diagram
Reset WDT
WTR(WDTCR[0])
Counter
0
..
18-bit WDT Counter
4
WDT_CLK
(WTCR[7])
HCLK/2048
Ext. Crystal
WTE
…...
Reserved
Figure 6.9-3 Watchdog Timer Block Diagram
10KHz
Figure 6.9-2 Watchdog Timer Clock Control
™
15
Series Technical Reference Manual
16
11
10
01
00
17
000
001
110
111
:
:
WDG_S (CLKSEL1[1:0])
WD_CLK_EN(APBCLK[0])
WTIS[10:8]
WDTCR.
- 267 -
Time-
select
out
clocks
Delay
1024
WDT
Publication Release Date: Sept 14, 2010
(WTCR[3])
(WTCR[6])
(WTCR[4])
(WTCR[1])
WTWKE
WTIF
WTIE
WTRE
WDT_CLK
Wakeup CPU from
Power-down mode
Watchdog
Watchdog
Interrupt
Reset
(WTCR[5])
(WTCR[2])
WTWKF
WTRF
Revision V1.2
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