UPD75238GJ

Manufacturer Part NumberUPD75238GJ
Description4 BIT SINGLE-CHIP MICROCOMPUTER
ManufacturerNEC [NEC]
UPD75238GJ datasheet
 
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Page 74/190

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Fig. 4-33 Timer Mode Operation Timing
CP
MODH
Count
0
1
2
register
T F/F
(PPO)
Set TPGM1.
Table 4-4 Modulo Register Settings
(When f
= 6.0 MHz)
X
MODL bits 2-6
6
5
4
3
2
0
0
1
0
0
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
0
(When f
= 4.19 MHz)
X
MODL bits 2-6
6
5
4
3
2
0
0
0
0
1
0
0
0
1
0
0
1
0
0
0
0
1
0
0
0
1
0
0
0
0
Cautions 1. A value other than the above cannot be set in MODL. Bits 0, 1, and 7 must be set to 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 for N.
74
N
N–1
N
0
N
Generate IRQTPG.
Interrupt generation interval
(f
= 6.0 MHz)
X
256 (N+1)/f
= 85.3 s - 10.9 ms
f
/256 (N+1) = 91.6 Hz - 11.7 kHz
X
X
128 (N+1)/f
= 42.7 s - 5.45 ms
f
/128 (N+1) = 183 Hz - 23.4 kHz
X
X
64 (N+1)/f
= 21.3 s - 2.73 ms
f
/64 (N+1) = 366 Hz - 46.9 kHz
X
X
f
/32 (N+1) = 732 Hz - 93.8 kHz
32 (N+1)/f
= 10.7 s - 1.37 ms
X
X
16 (N+1)/f
= 5.33 s - 683 s
f
/16 (N+1) = 1465 Hz - 188 kHz
X
X
Interrupt generation interval
(f
= 4.19 MHz)
X
256 (N+1)/f
= 122 s - 15.6 ms
f
/256 (N+1) =64 Hz - 8 kHz
X
X
128 (N+1)/f
= 61.0 s - 7.81 ms
f
/128 (N+1) = 128 Hz - 16 kHz
X
X
64 (N+1)/f
= 30.5 s - 3.91 ms
f
/64 (N+1) = 256 Hz - 32 kHz
X
X
32 (N+1)/f
= 15.3 s - 1.95 ms
f
/32 (N+1) = 512 Hz - 65 kHz
X
X
16 (N+1)/f
= 7.63 s - 977 s
f
/16 (N+1) = 1024 Hz - 131 kHz
X
X
PD75238
0
N
0
Square wave output frequency
(f
= 6.0 MHz)
X
Square wave output frequency
(f
= 4.19 MHz)
X