![Sino Wealth SH69K55A Скачать руководство пользователя страница 15](http://html1.mh-extra.com/html/sino-wealth/sh69k55a/sh69k55a_manual_1283061015.webp)
SH69P55A/K55A
15
5. System Clock and Oscillator
SH69P55A/69K55A has one clock source, which is determined in Code options. The oscillator generates the basic clock
pulses that provide the system clock to supply CPU and on-chip peripherals.
System clock f
SYS
= f
OSC
/4.
5.1. Instruction Cycle Time:
(1) 4/32.768kHz (
≈
122
µ
s) for 32.768kHz oscillator.
(2) 4/8MHz (= 0.5
µ
s) for 8 MHz oscillator.
5.2. Oscillator Type
(1) Crystal Oscillator: 32.768kHz or 400kHz - 8MHz
OSCI
OSCO
C1
C2
Crystal
PLL_C
(2) Ceramic Resonator: 400kHz - 8MHz
OSCI
OSCO
C1
C2
Ceramic
PLL_C
(3) RC Oscillator: 400kHz - 8MHz
OSCI
ROSC
V
DD
OSCO
PLL_C
External RC
(4) RC Oscillator: 4MHz
OSCI
OSCO
PLL_C
Internal RC
(5) PLL Oscillator (1, 2, 4, 8MHz)
OSCI
OSCO
C1
C2
32.768
kHz
PLL_C
C3 = 2200p
R
PLL
= 100K
Note:
- If the external RC oscillator is selected, OSCO pin is used as the I/O port (PORTC.1).
- If the internal RC oscillator is selected, OSCO pin is used as the I/O port (PORTC.1) and OSCI pin is used as the I/O port
(PORTC.2).
- If the PLL is disabled, PLL_C is used as the I/O port (PORTC.0).