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/fCLK, 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)
7654321
0
0
000
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
000
76543210
0
000
1
TMC1
Overflow flag
Enables counting TM1
×××
76543210
PRS10
0
PRM1 ××× PRS12 PRS11
×
Specifies count clock
(x/fCLK; where x = 16, 32, 64,
128, 256, or 512)