GMS30004 Datasheet, PDF (25/158 Pages) Hynix Semiconductor – 4-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 2. Architecture
Clock Generator
The GMS300 series has an internal clock oscillator. The oscillator circuit is
designed to operate with an external ceramic resonator. Internal capacitors are
available as a masked option. Oscillator circuit is able to organize by connecting
ceramic resonator to outside. (In order to built in capacitor for oscillation as
masked option.)
* It is necessary to connect capacitor to outside in order to change ceramic
resonator, You must examine refer to a manufacturer`s
22
OSC2
23
OSC1
Pulse generator
The following frequency and duty ratio are selected for carrier signal outputted
from the REMOUT port depending on a PMR (Pulse Mode Register) value set in
a program.
T
T1
PMR
0
1
2
3
4
5
* Default value is Ì0Ì
REMOUT signal
T=1/f_PUL = 12/f_OSC, T1/T = 1/2
T=1/f_PUL = 12/f_OSC, T1/T = 1/3
T=1/f_PUL = 8/f_OSC, T1/T = 1/2
T=1/f_PUL = 8/f_OSC, T1/T = 1/4
T=1/f_PUL = 11/f_OSC, T1/T = 4/11
No Pulse (same to D0~D9)
Table 2-2 PMR selection table
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