NEC PD78214 User Manual
Page 181
152
µ
PD78214 Sub-Series
Fig. 7-55 Timing of Interval Timer Operation (1)
n
n
0H
TM1
count value
MOD(2n)
MOD(3n)
FFH
MOD(2n)
MOD(3n)
MOD(4n)
Timer starts
Compare register
(CR10)
INTC10
interrupt request
Rewriting by inter-
rupt program
Interval
Interval
Interval
Rewriting by inter-
rupt program
Rewriting by inter-
rupt program
FFH
Remark Interval = n
× x/f
CLK
, 1
≤ n ≤ FFH
x = 16, 32, 64, 128, 256, 512
Fig. 7-56 Setting of Control Registers for Interval Timer Operation (1)
(a) Timer control register 1 (TMC1)
(b) Prescaler mode register 1 (PRM1)
(c) Capture/compare control register 1 (CRC1)
7
6
5
4
3
2
1
0
0
0
0
0
0
CRC1
Disables clearing TM1, when CR10
coincides with TM1
Specifies the CR11 register as a compare
register
Disables clearing TM1, when CR11
coincides with TM1
0
0
0
7
6
5
4
3
2
1
0
0
0
0
0
1
TMC1
Overflow flag
Enables counting TM1
Ч
Ч
Ч
7
6
5
4
3
2
1
0
PRS10
0
PRM1
Ч
Ч
Ч
PRS12 PRS11
×
Specifies count clock
(x/f
CLK
; where x = 16, 32, 64,
128, 256, or 512)