Format Of Basic Interval Timer Mode Register - NEC PD754144 User Manual

Figure 6-21. Format of Basic Interval Timer Mode Register
Address 3 2 1
F85H BTM3 BTM2 BTM1
Note In the µ PD754244 only, wait time is selectable when standby mode is released.
In the µ PD754144, wait time is always fixed to 2
116
CHAPTER 6 PERIPHERAL HARDWARE FUNCTION
0 Symbol
BTM0 BTM
µ
PD754144: f = 1.0 MHz
CC
0 0 0
0 1 1
1 0 1
1 1 1
Other
µ
PD754244: f = 6.0 MHz
X
0 0 0
0 1 1
1 0 1
1 1 1
Other
µ
PD754244: f = 4.19 MHz
X
0 0 0
0 1 1
1 0 1
1 1 1
Other
Basic interval timer/watchdog timer start control bit
When "1" is written to this bit, the basic interval timer/watchdog timer is started (counter
and interrupt request flag are cleared). When the timer starts operating, this bit is
automatically reset to "0".
User's Manual U10676EJ3V0UM
Specifies input clock
12
f /2 (244 Hz)
CC
9
f /2 (1.95 kHz)
CC
7
f /2 (7.81 kHz)
CC
5
f /2 (31.3 kHz)
CC
Setting prohibited
Specifies input clock
12
f /2 (1.46 kHz)
X
9
f /2 (11.7 kHz)
X
7
f /2 (46.9 kHz)
X
5
f /2 (188 kHz)
X
Setting prohibited
Specifies input clock
12
f /2 (1.02 kHz)
X
9
f /2 (8.19 kHz)
X
7
f /2 (32.768 kHz)
X
5
f /2 (131 kHz)
X
Setting prohibited
(512 µ s at 1.0 MHz).
9
/f
CC
Interrupt interval time
20
2 /f (1.05 s)
CC
17
2 /f (131 ms)
CC
15
2 /f (32.8 ms)
CC
13
2 /f (8.19 ms)
CC
–
Interrupt interval time (wait time
when standby mode is released)
20
2 /f (175 ms)
X
17
2 /f (21.8 ms)
X
15
2 /f (5.46 ms)
X
13
2 /f (1.37 ms)
X
–
Interrupt interval time (wait time
when standby mode is released)
20
2 /f (250 ms)
X
17
2 /f (31.3 ms)
X
15
2 /f (7.81 ms)
X
13
2 /f (1.95 ms)
X
–
Note
Note