HD4074329S Renesas Electronics America, HD4074329S Datasheet - Page 40
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HD4074329S
Manufacturer Part Number
HD4074329S
Description
MCU 4-Bit HMCS400 CISC 20KB EPROM 3.3V/5V 64-Pin SDIP
Manufacturer
Renesas Electronics America
Datasheet
1.HD4074329S.pdf
(98 pages)
Specifications of HD4074329S
Package
64SDIP
Family Name
HMCS400
Maximum Speed
4.5 MHz
Ram Size
268 Byte
Program Memory Size
20 KB
Operating Supply Voltage
3.3|5 V
Data Bus Width
4 Bit
Program Memory Type
EPROM
Number Of Programmable I/os
35
On-chip Adc
4-chx8-bit
Operating Temperature
-20 to 75 °C
Number Of Timers
3
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HD404328 Series
36
When the MCU is in watch mode or subactive mode, if the high level period before the falling edge of
INT
falling edge of INT
Edge detection is shown in figure 19. The level of the INT
When this sampled value changes to low from high, a falling edge is detected.
In figure 20, the level of the INT
low at point A, and also low at point B. Therefore, a falling edge is not detected. In (b), the sampled
value is high at point A, and also high at point B. A falling edge is not detected in this case either.
When the MCU is in watch mode or subactive mode, keep the high level and low level period of INT
longer than interrupt frame.
INT
Interrupt
frame
0
0
is shorter than the interrupt frame, INT
A: Low
a. High level period
0
is shorter than the interrupt frame, INT
INT
Sampling
0
0
B: Low
signal is sampled by an interrupt frame. In (a) the sampled value is
Figure 20 Sampling Example
Figure 19 Edge Detection
High
0
is not detected. Also, if the low level period after the
INT
Interrupt
frame
Low
0
0
0
signal is sampled by a sampling clock.
is not detected.
Low
A: High
b. Low level period
B: High
0
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