
CHAPTER 3 CPU FUNCTIONS
Preliminary User’s Manual U16895EJ1V0UD
79
Peripheral Function
Register Name
Access
k
WDTM1
Write
1 to 5
Watchdog timer 1 (WDT1)
<Calculation of number of waits>
{(1/fX)
× 2/((2 + m)/fCPU)} + 1
fX: Main clock oscillation frequency
Watchdog timer 2 (WDT2)
WDTM2
Write
3 (fixed)
TP0CCR0, TP0CCR1,
TP0CNT
Read
1
<Calculation of number of waits>
{(1/fXX)/((2 + m)/fCPU)} + 1
TP0CCR0, TP0CCR1
Write
0 to 2
16-bit timer/event counter P0
(TMP0)
<Calculation of number of waits>
{(1/fXX)
× 5/((2 + m)/fCPU)}
A wait occurs when performing continuous write to same register
16-bit timer/event counters 00, 01
(TM00, TM01)
TMC00, TMC01
Read-modify-write
1 (fixed)
A wait occurs during write
CSIA0B0 to CSIA0BF
Write
Note 1
0 to 18 (when performing
continuous write via write
instruction)
<Calculation of number of waits>
{(1/fSCKA)
× 5 – (4 + m)/fCPU)}/{((2 + m)/fCPU)}
However, 1 wait if fCPU = fXX if the CSIS0.CKSA01 and CSIS0.CKSA00 bits are 00.
fSCKA: CSIA selection clock frequency
CSIA0B0 to CSIA0BF
Write
Note 1
0 to 20 (when conflict
occurs between write
instruction and write via
receive operation)
Clocked serial interface 0 with
automatic transmit/receive function
(CSIA0)
<Calculation of number of waits>
{((1/fSCKA)
× 5)/((2 + m)/fCPU)}
fSCKA: CSIA selection clock frequency
I
2C0Note 2
IICS0
Read
1 (fixed)
Asynchronous serial interfaces 0, 1
(UART0, UART1)
ASIS0, ASIS1
Read
1 (fixed)
Real-time output function 0 (RTO0)
RTBL0, RTBH0
Write (when RTPC0.RTPOE0
bit = 0)
1
ADM, ADS, PFM, PFT
Write
1 to 2
ADCR, ADCRH
Read
1 to 2
A/D converter
<Calculation of maximum number of waits>
{(1/fXX)
× 2/[(2 + m)/fCPU]} + 1
Number of waits to be added = (2 + m)
× k [clocks]
Notes 1. If fetched from the internal RAM, the number of waits is as shown above.
If fetched from the external memory, the number of waits may be fewer than the number shown
above.
The effect of the external memory access cycle differs depending on the wait settings, etc.
However, the number of waits above is the maximum value.
2. I
2C0 is available only in the
PD703308Y, 70F3306Y, and 70F3308Y.