UPD78F1154GK-GAK-AX NEC, UPD78F1154GK-GAK-AX Datasheet - Page 32

• Manufacturer Part Number: UPD78F1154GK-GAK-AX
• Description: 16BIT MCU, 128K FLASH, 8K RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F1154GK-GAK-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 70
• Ram Memory Size: 8192Byte
• Cpu Speed: 20MHz
• No. Of Timers: 9
• No. Of: RoHS Compliant
• Core Size: 16bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

32
7.2 Clock Generator
The clock generator generates the clock to be supplied to the CPU and peripheral hardware.
The following three kinds of system clocks and clock oscillators are selectable.
(1) Main system clock
(2) Subsystem clock
(3) Internal low-speed oscillation clock (clock for watchdog timer)
Remark f
<1> X1 oscillator
<2> High-speed internal oscillator
An external main system clock (f
• XT1 oscillator
• Internal low-speed oscillator
This circuit oscillates a clock of f
XT2.
This circuit oscillates a clock of f
clock operation is determined by setting the option byte.
The internal low-speed oscillation clock cannot be used as the CPU clock.
This circuit oscillates a clock of f
This circuit oscillates a clock of f
operating with this internal high-speed oscillation clock.
f
f
f
X
IH
EX
SUB
:
:
:
: Subsystem clock frequency
X1 clock oscillation frequency
Internal high-speed oscillation clock frequency
External main system clock frequency
EX
Preliminary Product Information U17892EJ2V0PM
IL
= 2 to 20 MHz) can also be supplied from the EXCLK/X2/P122 pin.
SUB
= 240 kHz (TYP.). After a reset release, the internal low-speed oscillation
X
= 32.768 kHz by connecting a 32.768 kHz resonator across XT1 and
= 2 to 20 MHz by connecting a resonator to X1 and X2.
IH
= 8 MHz (TYP.). After a reset release, the CPU always starts
78K0R/KF3