GMS81004 Datasheet, PDF (41/101 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 4. Peripheral Hardware
4.1.2 Prescaler
Prescaler consists of 12-bit binary counter. The clock supplied from oscillation circuit is
input to prescaler (fex). The divided output from each bit of prescaler is provided to
peripheral hardware.
4.1.3 Peripheral hardware clock control
Clock to peripheral hardware can be stopped by bit4 (ENPCK) of CKCTLR Register.
ENPCK is set to ¡È1¡È in reset state.
fex
ENPCK
PS1 PS2 PS3 PS4 PS5 PS6 PS7 PS8 PS9 PS10 PS11 PS12
B.I.T
fcpu
PS0
PS1 PS2 PS3 PS4 PS5 PS6 PS7 PS8 PS9 PS10 PS11 PS12
Peripheral
fex(MHz)
PS0 PS1 PS2 PS3 PS4 PS5 PS6 PS7 PS8 PS9 PS10 PS11 PS12
Freq
4M
2M
1M 500K 250K 125K 62.5K 31.25K 15.63K 7.183K 3.906K 1.953K 0.976K
4
Period(s) 250n 500n 1u 2u 4u 8u 16u 32u 64u 128u 256u 512u 1024u
Freq
2M
1M 500k 250K 125K 62.5K 31.25K 15.63K 7.183K 3.906K 1.953K 0.976K 0.488K
2
Period(s) 500n 1u 2u 4u 8u 16u 32u 64u 128u 256u 512u 1024u 2048u
Fig. 4.3 Block diagram of Prescaler
4 -3