UPD75518 NEC, UPD75518 Datasheet - Page 79

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

Count
register
MODH
(PPO)
T F/F
(Frequency when f
(Frequency when f
Cautions 1. A value other than the above cannot be set in MODL. Bits 0, 1, and 7 must be set to 0.
CP
6
0
0
0
0
1
6
0
0
0
0
1
5
0
0
0
1
0
5
0
0
0
1
0
2. N is the set value of MODH. 0 must not be set for N. Be sure to set a value from 1 to 255
MODL bits 2-6
MODL bits 2-6
for N.
0
Set TPGM1.
4
0
0
1
0
0
4
0
0
1
0
0
X
X
= 6.0 MHz)
= 4.19 MHz)
3
0
1
0
0
0
3
0
1
0
0
0
1
2
1
0
0
0
0
2
1
0
0
0
0
Fig. 4-31 Timer Mode Operation Timing
2
Table 4-7 Modulo Register Settings
256 (N+1)/f
128 (N+1)/f
64 (N+1)/f
32 (N+1)/f
16 (N+1)/f
256 (N+1)/f
128 (N+1)/f
64 (N+1)/f
32 (N+1)/f
16 (N+1)/f
Interrupt generation interval
(f
Interrupt generation interval
(f
X
X
= 6.0 MHz)
= 4.19 MHz)
N–1
X
X
X
X
X
X
X
X
X
X
= 30.5 s - 3.91 ms
= 15.3 s - 1.95 ms
= 7.63 s - 977 s
= 21.3 s - 2.73 ms
= 10.7 s - 1.37 ms
= 5.33 s - 683 s
= 122 s - 15.6 ms
= 61.0 s - 7.81 ms
= 85.3 s - 10.9 ms
= 42.7 s - 5.46 ms
N
N
0
Generate IRQTPG.
f
f
f
f
f
N
f
f
f
f
f
X
X
X
X
X
X
X
X
X
X
/256 (N+1) = 91.6 Hz - 11.7 kHz
/128 (N+1) = 183 Hz - 23.4 kHz
/64 (N+1) = 366 Hz - 46.9 kHz
/32 (N+1) = 732 Hz - 93.8 kHz
/16 (N+1) = 1465 Hz - 188 kHz
Square wave output frequency
(f
/256 (N+1) =64 Hz - 8 kHz
/128 (N+1) = 128 Hz - 16 kHz
/64 (N+1) = 256 Hz - 32 kHz
/32 (N+1) = 512 Hz - 65 kHz
/16 (N+1) = 1024 Hz - 131 kHz
Square wave output frequency
(f
X
X
= 6.0 MHz)
= 4.19 MHz)
0
PD75518(A)
N
0
79