GMS81004 Datasheet, PDF (39/101 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 4. Peripheral Hardware
CHAPTER 4. PERIPHERAL HARDWARE
4.1 CLOCK GENERATING CIRCUIT
Clock generating circuit consists of Clock Pulse Generator(C.P.G), Prescaler, Basic
Interval Timer(B.I.T) and Watch Dog Timer.
The clock applied to the Xin pin divided by two is used as the internal system clock.
fex
OSC
Circuit
fcpu
C.P.G
Internal System Clock
PRESCALER
PS1
ENPCK
8
MUX
0
7
B.I.T (8)
3
Peripheral
BTCL
CKCTLR 0 1 2 3 4 5
IFBIT
0
5
WDT (6)
WDTCL
COMPARATOR
WDTON
6
0
WDTR
56
6
IFWDT
To Reset
Circuit
Internal Data Bus
Fig. 4.1 Block diagram of clock generating circuit
4 -1