參數(shù)資料
型號: HD4074654S
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer
中文描述: 4位單片機(jī)
文件頁數(shù): 31/109頁
文件大?。?/td> 430K
代理商: HD4074654S
HD404654 Series
31
Internal Oscillator Circuit
A block diagram of the clock generation circuit is shown in figure 17. As shown in table 18, a ceramic
oscillator or crystal oscillator can be connected to OSC
1
and OSC
2
. The system oscillator can also be
operated by an external clock. Bit 1 (SSR11) of system clock select register 1 (SSR1: $029) and bit 2
(SSR22) of system clock select register 2 (SSR2: $02A) must be selected according to the frequency of the
oscillator connected to OSC
1
and OSC
2
(figure 18).
Note:
If the SSR10, SSR11 and SSR22 setting does not match the oscillator frequency, the DTMF
generator will malfunction.
After
RESET
input or after stop mode has been cancelled, the division ratio of the system clock can be
selected as 1/4 or 1/32 by setting the SEL pin level.
1/4 division ratio: Connect SEL to V
CC
.
1/32 division ratio: Connect SEL to GND.
OSC
2
OSC
1
System
oscillator
1/4 or
1/32
division
circuit
*
Timing
generator
circuit
CPU with ROM,
RAM, registers,
flags, and I/O
Peripheral
function
interrupt
f
cyc
t
cyc
f
OSC
φ
CPU
φ
PER
Note:
*
1/4 or 1/32 division ratio can be selected by pin SEL.
Figure 17 Clock Generation Circuit
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