LAPIS Semiconductor ML610421, User Manual, Page: 432 / 437

ML610Q421/ML610Q422/ML610421 User’s Manual
Appendix E Check List
E – 2
Chapter 6 Clock generation circuit
•
Initial System clock
[ ] At power up or system reset, both built-in 500kHz RC oscillation and 32.768kHz crystal oscillation are oscillating,
and 1/8 of the 500kHz RC oscillation clock(62.5kHz) is selected as a system clock for CPU.
•
PLL oscillation clock
[ ] The PLL oscillation generates 8MHz clock which can be driven to an output pin, however the maximum CPU
operating frequency is 4MHz.
•
Switching high-speed clock operation mode to low-speed clock operation mode
[ ] When switching the high-speed clock to the low-speed clock after the power up, confirm the low-speed clock is
oscillating for sure by checking Q128H bit is “1”.
•
Switching high-speed clock operation mode to another high-speed clock operation mode
[ ] When switching the high-speed clock mode, the clock must be first switched back to low clock before switching to
other high-speed clock (Refer to Section 6.2.2.).
•
Port 2
nd
Function
[ ] Specify the 2
nd
function for the port 2 when driving a clock to the pin(Refer to Section 6.4 in the user’s manual).
[ ] A high-speed crystal/ceramic oscillation or an external clock input mode does not require specifying the 2
nd
function
for the port 1(Refer to Section 18.3.2.)
Chapter 7 TBC (Time Base Counter)
•
HTBCLK
[ ] HTBLK goes through the HTBDR register. Set proper valute to the register(Refer to Section 7.2.3. in the user’s
manual).
•
How to read LTBC
[ ] Read consecutively LTBC(Low-speed Time Base Counter) twice until the last data coincides the previous data to
prevent reading of uncertain data while counting up the clock (Refer to Section 7.3.1 in the user’s manual).
Chapter 10 Timer
•
How to read the timer counter registers
[ ] Check notes for reading the timer counter registers while counting up(Refer to Section 10.2.6. ~ 10.2.9. in the user’s
manual).
Chapter 11 PWM
•
Used Pin
[ ] P34(PWM0) pin or P43(PWM0) pin is used.
•
How to read the PWM counter registers
[ ] Check notes for reading the PWM counter registers while the PWM is operating(Refer to Section 11.2.4. in the
user’s manual).
•
Port 2
nd
Function
[ ] Specify the 2
nd
Function for the port(Refer to Section 11.4 in the user’s manual).
Chapter 12 WDT
•
Overflow period
Clear WDT during the selected overflow period:
[ ] 125ms, [ ] 500ms, [ ] 2s, [ ] 8s
•
WDP
[ ] Check the WDP before writing to the WDTCON and determine writing “5AH” or “0A5H” (Refer to Section 12.2.2. in
the user’s manual).