參數(shù)資料
型號(hào): HD404639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位單片機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 36/133頁
文件大小: 803K
代理商: HD404639R
HD404639R Series
36
Internal Oscillator Circuit
A block diagram of the clock generation circuit is shown in figure 23. As shown in table 20, a ceramic
oscillator or crystal oscillator can be connected to OSC
1
and OSC
2
, and a 32.768-kHz oscillator can be
connected to X1 and X2. The system oscillator can also be operated by an external clock. System clock
select register 1 (SSR1: $029) and 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 24).
Note:
If the SSR10, SSR11, SSR22 and SSR23 setting does not match the oscillator frequency, the
DTMF generator and subsystems using the 32.768-kHz oscillation will malfunction.
OSC
2
OSC
1
X1
X2
System
oscillator
Sub-
system
oscillator
1/4 or
1/8 or
1/16 or
1/32
division
circuit*
Timing
generator
circuit
System
clock
selection
CPU with ROM,
RAM, registers,
flags, and I/O
Peripheral
function
interrupt
Time-base
interrupt
Time-base
clock
selection
1/8 or 1/4
division
circuit*
Timing
generator
circuit
Timing
generator
circuit
1/8
division
circuit
f
W
t
Wcyc
f
SUB
t
subcyc
LSON
TMA3
f
cyc
t
cyc
f
OSC
f
X
CPU
PER
CLK
Notes: 1.
2.
1
2
1/4, 1/8, 1/16 or 1/32 division ratio can be selected by setting bits 1 and 0 of
system clock select register 2 (SSR2: $02A).
1/8 or 1/4 division ratio can be selected by setting bit 2 of system clock select
register 1 (SSR1: $029).
Figure 23 Clock Generation Circuit
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