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FAQ
Specification
01. Setting GPIO by MOV or MOVX instruction?
Ans. Support both MOV & MOVX instruction. MOVX instruction is for GPIOA~GPIOF port. MOV instruction is for typical 8051 I/O. MCU provides 4 GPIO pins supporting 8051 Port 0 functions, can use MOV, SETB and CLR instruction to set the level status of GPIO. For more details please consult the GPIO Example Program.
 
02. How to reach the same effect with using external RESET pin for reset?
Ans. Due to WT56F216/WT51F104 both build in LVD/LVDR, it can reach the effect by Low Voltage Detection Reset. For more details please consult the Low Voltage Detection Reset (LVDR) section in the Data Sheet.
 
03. How long does it take from MCU power-up to Reset completed? And how to solve the problem of peripheral LED blinking during this period?
Ans. It takes 16ms from WT56F216/WT51F104 power-up to Reset completed.
The GPIO initial value of WT56F216/WT51F104 is Input Tri-state, and thus LED will not blink.
 
04. How to keep memory data for WT56F216/WT51F104 in power-down mode?
Ans. Both WT56F216/WT51F104 support emulated E2PROM, and thus all status can be saved in flash after completing each power-on procedure. For more details please consult the Emulated E2PROM application documents.
 
05. The power consumption of WT56F216/WT51F104 in each modes.
Ans. Four operation mode switching is illustrated in the figure below: (referring to Data Sheet “Power Management” section for more details)
Operating
Mode
8051 Peripheral
Clock
XTAL
(12MHz)
XTAL
(32.768kHz)
IRC
(12MHz)
IRC
(32kHz)
Power
Consumption@5V
Normal 1 on on off off on on 3.6mA
Normal 2 on on off on on on 3.6mA
Normal 3 on on on off off off 4.4mA
Green 1 on on off off off on 17uA
Green 2 on on off on off off 40uA
Idle 1 off on off off on on 650uA
Idle 2 off off off off on on 500uA
Sleep 1 off off off off off off 300uA
Sleep 2 off off off off off off 5uA
 
06. How long does it take to program all over the flash for WT56F216 & WT51F104?
Ans.
WT56F216 programming 16Kbyte takes 20 seconds. WT51F104 programming 4Kbyte takes 3.5 seconds.
 
07. IRC 12MH Frequency Tolerance.
Ans. Internal 12 MHz RC Oscillator Temperature Tolerance table.
Parameter Symbol Pin/condition Specification Units
Min Typ. Max
RC Frequency FRC VDD = 1.8V ~ 5.5V Ans. 12 Ans. MHz
Frequency Tolerance@VDD=2.2V(fixed) ΔFRC/FRC Without external oscillator for calibrating 0°C ~ 70°C Ans. ± 3 Ans. %
Without external oscillator for calibrating-40°C ~ 85°C Ans. ± 5 Ans. %
Without external oscillator for calibrating-40°C ~ -125°C Ans. ± 7 Ans. %
With external oscillator for calibrating Ans. Ans. ± 2 %
 
08. Safety requlation testing for WT56F216 & WT51F104
Ans. Tested by the qualified LAB, EFT can reach ±4KV; ESD Contact can reach ±4KV; Air can reach ±15KV.
 
09. Converting modes of ADC.
Ans.
1.Single Mode: turning on ADC & enabling Single conversion, then reading data after the conversion is completed.
2.Continuous Mode: turning on ADC & enabling continuous conversion, and MCU will keep on converting. After the convertion is completed, it will update A/D converter converting High/Low bytes Register.
3.Timer Auto Mode: working together with the time set by the Watch timer, Timer auto converting ADC data.
 
10. Is output phase of PWM adjustable?
Ans. PWM Control Register provides output phase setting bit.
 
11. Does WT56F216/WT51F104 support external crystal oscillator 4 MHz or 8 MHz?
Ans. It can support external crystal oscillator 4 MHz or 8 MHz but requiring enabling ISP_CHG_12M & UART_ISP_CHG bit in the program. IRC_12M_PD1 & IRC_12M_PD2 can be turned off only after the Source clock selecting external oscillator. For more details please consult the Power Management section and Example program in the Data Sheet.
 
12. oes WT56F216/WT51F104 support Compile program? Is Emulated and programming function available in KEIL C environment?
Ans. WT56F216/WT51F104 supports Compile program and it also supports Emulated and programming function in KEIL C environment.

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