UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 136

• Manufacturer Part Number: UPD75238GJ
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC [NEC]

136
Address
FB4H
FB5
Notes 1. 0.95 s, 1.91 s, 3.82 s, or 15.3 s at 4.19 MHz
Caution Since changing the edge detection mode register may set an interrupt request flag, disable the
2. 15.3 s at 4.19 MHz
IM03
3
0
interrupts before changing the edge detection mode register. Then clear the interrupt request
flag with a CLR1 instruction and enable the interrupts. When f
clock pulse in changing IM0, wait for 16 machine cycles after changing the mode register and
clear the interrupt request flag.
2
0
0
IM01
Fig. 5-4 Format of Edge Detection Mode Registers
1
0
IM00
IM10
0
Detection edge specification
Sampling clock
IM1
Symbol
IM0
0
0
1
1
0
1
0
1
f
Specifies rising edge.
Specifies falling edge.
X
/64 (10.7 s at 6.0 MHz)
0
1
0
1
(0.67 s, 1.33 s, 2.67 s, or 10.7 s at 6.0 MHz)
Specifies rising edge.
Specifies falling edge.
Specifies both rising and falling edges.
Ignored (interrupt request flag is not set.)
Note 2
X
/64 is selected as a sampling
Note 1
PD75238