UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 128

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

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

6.3 Registers Controlling Clock Generator
(1) Processor clock control register (PCC)
128
The following seven registers are used to control the clock generator.
• Processor clock control register (PCC)
• Internal oscillator mode register (RCM)
• Main clock mode register (MCM)
• Main OSC control register (MOC)
• Clock operation mode select register (OSCCTL)
• Oscillation stabilization time counter status register (OSTC)
• Oscillation stabilization time select register (OSTS)
This register is used to select the CPU clock and the division ratio.
PCC is set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets PCC to 01H.
Remarks 1.
2.
3.
5.
6.
7.
9.
10. f
11. f
4.
8.
f
f
f
f
f
f
f
f
f
X
RH
EXCLK
XH
XP
PRS
CPU
XT
EXCLKS
SUB
RL
:
:
:
:
:
:
:
:
:
: External main system clock frequency
: External subsystem clock frequency
X1 clock oscillation frequency
Internal high-speed oscillation clock frequency
High-speed system clock oscillation frequency
Main system clock oscillation frequency
Peripheral hardware clock frequency
CPU clock oscillation frequency
XT1 clock oscillation frequency
Subsystem clock frequency
Internal low-speed oscillation clock frequency
CHAPTER 6 CLOCK GENERATOR
User’s Manual U17554EJ4V0UD