UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 141
![8BIT MCU, 128K FLASH, 7K RAM, LQFP](/photos/19/1/190186/ge64lqfp05-40_sml.jpg)
UPD78F0890GK(A)-GAJ-AX
Manufacturer Part Number
UPD78F0890GK(A)-GAJ-AX
Description
8BIT MCU, 128K FLASH, 7K RAM, LQFP
Manufacturer
NEC
Datasheet
1.UPD78F0890GKA-GAJ-AX.pdf
(732 pages)
Specifications of UPD78F0890GK(A)-GAJ-AX
Controller Family/series
UPD78F
No. Of I/o's
55
Ram Memory Size
7KB
Cpu Speed
20MHz
No. Of Timers
10
No. Of Pwm
RoHS Compliant
Core Size
8bit
Program Memory Size
128KB
Oscillator Type
External, Internal
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6.5 Clock Generator Operation
mode.
the 78K0/FE2, thus enabling the following.
(1) Enhancement of security function
(2) Improvement of performance
The clock generator generates the following clocks and controls the operation modes of the CPU, such as standby
• Main system clock f
• Subsystem clock f
• Internal low-speed oscillation clock f
• CPU clock f
• Peripheral hardware clock f
The CPU starts operation when the on-chip internal high-speed oscillator starts outputting after a reset release in
When the X1 clock is set as the CPU clock by the default setting, the device cannot operate if the X1 clock is
damaged or badly connected and therefore does not operate after reset is released. However, the start clock of
the CPU is the on-chip internal high-speed oscillation clock, so the device can be started by the internal high-
speed oscillation clock after a reset release. Consequently, the system can be safely shut down by performing a
minimum operation, such as acknowledging a reset source by software or performing safety processing when
there is a malfunction.
Because the CPU can be started without waiting for the X1 clock oscillation stabilization time, the total
performance can be improved.
A timing diagram of the CPU default start using the internal high-speed oscillation clock is shown in Figure 6-12
and 6-13.
• High-speed system clock f
• Internal high-speed oscillation clock f
• XT1 clock f
• External subsystem clock f
X1 clock f
External main system clock f
CPU
X
XT
SUB
XP
PRS
XH
EXCLKS
EXCLK
CHAPTER 6 CLOCK GENERATOR
RL
User’s Manual U17554EJ4V0UD
RH
141
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