344
CHAPTER 16 INTERRUPT AND TEST FUNCTIONS
User’s Manual U11302EJ4V0UM
(5) Sampling clock select register (SCS)
This register is used to set the clock used to sample the valid edge input to INTP0. When remote controlled
data reception is carried out using INTP0, digital noise is eliminated using the sampling clock.
SCS is set with an 8-bit memory manipulation instruction.
RESET input clears SCS to 00H.
Figure 16-6. Format of Sampling Clock Select Register
Caution
f
X
/2
N + 1
is the clock supplied to the CPU, f
X
/2
6
and f
X
/2
7
are the clocks supplied to the
peripheral hardware. f
X
/2
N + 1
stops in the HALT mode.
Remarks 1.
N: Value (N = 0 to 4) of bits 0 to 2 (PCC0 to PCC2) of processor clock control register (PCC)
2.
f
X
: Main system clock oscillation frequency
3.
Figures in parentheses apply to operation with f
X
= 5.0 MHz.
6
5
4
3
2
1
0
7
Symbol
SCS
0
0
0
0
0
0
SCS1 SCS0
FF47H 00H R/W
Address After reset R/W
SCS1
0
0
1
INTP0 sampling clock selection
f
X
/2
N + 1
Setting prohibited
f
X
/2
6
(78.1 kHz)
SCS0
0
1
0
1
f
X
/2
7
(39.1 kHz)
1
Содержание mPD780208 Subseries
Страница 2: ...2 User s Manual U11302EJ4V0UM MEMO...