M0516ZAN Nuvoton Technology Corporation of America, M0516ZAN Datasheet - Page 64

• Manufacturer Part Number: M0516ZAN
• Description: IC MCU 32BIT 64KB FLASH 33QFN
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro M051™r

Specifications of M0516ZAN

• 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: 24
• Program Memory Size: 64KB (64K 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 5x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 33-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Register Write-Protection Control Register (REGWRPROT)
Some of the system control registers need to be protected to avoid inadvertent write and disturb
the chip operation. These system control registers are protected after the power on reset till user
to disable register protection. For user to program these protected registers, a register protection
disable sequence needs to be followed by a special programming. The register protection disable
sequence is writing the data “59h”, “16h” “88h” to the register REGWRPROT address at
0x5000_0100 continuously. Any different data value, different sequence or any other write to
other address during these three data writing will abort the whole sequence.
After the protection is disabled, user can check the protection disable bit at address 0x5000_0100
bit0, “1” is protection disable, “0” is protection enable. Then user can update the target protected
register value and then write any data to the address “0x5000_0100” to enable register protection.
Writing to this register to disable/enable register protection ,and reading it to get the
REGPROTDIS status
Register
REGWRPR
OT
Bits
31
23
15
7
NuMicro M051
Offset
GCR_BA+100 R/W
Descriptions
30
22
14
6
R/W
29
21
13
5
™
REGWRPROT[7:1]
Description
Register Write-Protection Control Register
Series Technical Reference Manual
28
20
12
4
- 64 -
Reserved
Reserved
Reserved
27
19
11
3
Publication Release Date: Sep 14, 2010
26
18
10
2
25
17
9
1
Revision V1.2
Reset Value
0x0000_0000
REGWRPR
OT [0]
REGPROTD
IS
24
16
8
0