
S1C62740 TECHNICAL SOFTWARE
EPSON
II-79
CHAPTER 7: SUMMARY OF NOTES
Make this waiting time the amount of time or more calculated
by the following expression.
10
× C × R
C: terminal capacitance 5 pF + parasitic capacitance ? pF
R: pull up registance 300 k
LCD driver (1) The contents of the display memory are undefined until the area
is initialized (through, for instance, memory clear processing by
the CPU). Initialize the display memory by executing initial
processing.
(2) Since the display memory area is write-only, display data
cannot be rewritten by arithmetic operations (such as AND, OR,
ADD, SUB).
Clock timer (1) Be sure to data reading in the order of low-order data (TM0–
TM3) then high-order data (TM4–TM7).
(2) When the clock timer has been reset, the interrupt factor flag
(IT) may sometimes be set to "1". Consequently, perform flag
reading (reset the flag) as necessary at reset.
(3) When the clock timer has been reset, the watchdog timer is also
reset.
Stopwatch timer (1) Be sure to data reading in the order of low-order data (SWL0–
SWL3) then high-order data (SWH0–SWH3).
(2) When the stopwatch timer has been reset, the interrupt factor
flag (ISW) may sometimes be set to "1". Consequently, perform
flag reading (reset the flag) as necessary at reset.
Programmable timer (1) When initiating programmable timer count, perform program-
ming by the following steps:
1. Set the initial data to RD0–RD7.
2. Reset the programmable timer by writing "1" to PTRST.
3. Start the down-count by writing "1" to PTRUN.
(2) When the reload register (RD0–RD7) value is set at "00H", the
down-counter becomes a 256-value counter.
(3) Be sure to data reading in the order of low-order data (PT0–PT3)
then high-order data (PT4–PT7).
(4) If R01 terminal is program for PTOVF output, then R01 register
(D4H, D1) must be set as "0", and R01 terminal output the fre-
quency = (PT Input predivided frequency)/[(PT reload register) * 2].
If R01 terminal is program for DC output, then PTR01 (E9H, D3)
must be set as "0".