UPD784915B Datasheet, PDF (33/86 Pages) NEC – 16-BIT SINGLE-CHIP MICROCONTROLLERS

µPD784915B, 784916B
3.6 Super Timer Unit
The µPD784916B is provided with a super timer unit that consists of the timers shown in Table 3-6.
Table 3-6. Configuration of Super Timer Unit
Unit Name Timer/Counter
Timer 0
TM0
(16-bit timer)
EC
(8-bit counter)
Free running FRC
counter
(22-bit counter)
Timer 1
TM1
(16-bit timer)
Timer 2
Timer 4
TM3
(16-bit timer)
EDV
(8-bit counter)
TM2
(16-bit timer)
TM4
(16-bit timer)
Timer 5
TM5
(16-bit timer)
Up/down
UDC
counter
(5-bit counter)
PWM output
-
unit
Resolution
1 µs
Maximum
Count Time
65.5 ms
-
125 ns
-
524 ms
1 µs
65.5 ms
1 µs or 1.1 µs 65.5 ms or
71.5 ms
-
-
1 µs
65.5 ms
2 µs
131 ms
2 µs
-
-
131 ms
-
-
Register
Remark
CR00
Controls delay of video head switching signal
CR01
Controls delay of audio head switching signal
CR02
Controls pseudo VSYNC output timing
ECC0, ECC1, Creates internal head switching signal
ECC2, ECC3
CPT0
Detects reference phase (to control drum phase)
CPT1
Detects phase of drum motor (to control drum
phase)
CPT2
Detects speed of drum motor (to control drum
speed)
CPT3
Detects speed of capstan motor (to control
speed of capstan motor)
CPT4, CPT5 Detects remaining tape for reel FG
CR10
Playback: Creates internal reference signal
Recording: Buffer oscillator in case VSYNC is
missing
CR11
Controls RECCTL output timing
CR12
Detects phase of capstan motor (to control
capstan phase)
CR13
Controls VSYNC mask as noise prevention
measures
CR30, CR31 Controls duty detection timing of PBCTL sig-
nal
CPT30
Measures cycle of PBCTL signal
EDVC
Divides CFG signal frequency
CR20
CR40
CR41
CR50
UDCC
Can be used as interval timer (to control sys-
tem)
Detects duty of remote controller signal (to
decode remote controller signal)
Measures cycle of remote controller signal (to
decode remote controller signal)
Can be used as interval timer (to control sys-
tem)
Creates linear tape counter
PWM0, PWM1, ^{16-bit resolution (carrier frequency: 62.5 kHz)}
PWM5
PWM2, PWM3, ^{8-bit resolution (carrier frequency: 62.5 kHz)}
PWM4
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