參數(shù)資料
型號: HD4048212R
廠商: Hitachi,Ltd.
英文描述: AS Microcomputer Incorporating a LCD controller/Driver Circuit(帶LCD控制/驅(qū)動電路的微計算機)
中文描述: 由于微機安裝有LCD控制器/驅(qū)動電路(帶液晶控制/驅(qū)動電路的微計算機)
文件頁數(shù): 42/147頁
文件大?。?/td> 519K
代理商: HD4048212R
HD404829R Series
42
Internal Oscillator Circuit
A block diagram of the clock generation circuit is shown in figure 26. As shown in table 16, a ceramic
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. Bit 1 (SSR1) of the system clock
select register (SSR: $029) must be set according to the frequency of the oscillator connected to OSC
1
and
OSC
2
(figure 27).
Note:
If the system clock select register (SSR: $029) setting does not match the oscillator frequency,
DTMF generator and subsystems using the 32.768-kHz oscillation will malfunction.
OSC
2
OSC
1
X1
X2
System
clock
oscillator
Sub-
system
clock
oscillator
1/4
division
circuit
Timing
generation
circuit
System
clock
selection
circuit
CPU with ROM,
RAM, registers,
flags, and I/O
Internal
peripheral
module
interrupt
(other than timer A)
Time A
interrupt
Clock
Time-base
clock
selection
circuit
1/8 or 1/4
division
circuit
Timing
generation
circuit
Timing
generation
circuit
1/8
division
circuit
f
W
t
Wcyc
f
SUB
t
subcyc
LSON
TMA3 bit
f
cyc
t
cyc
f
OSC
f
X
CPU
PER
CLK
Note:
*
*
1/8 or 1/4 division ratio can be selected by setting bit 2 of the system
clock select register (SSR: $029).
Figure 26 Clock Generation Circuit
相關(guān)PDF資料
PDF描述
HD4074829 AS Microcomputer Incorporating a LCD controller/Driver Circuit(帶LCD控制/驅(qū)動電路的微計算機)
HD404828R AS Microcomputer Incorporating a LCD controller/Driver Circuit(帶LCD控制/驅(qū)動電路的微計算機)
HD404829R AS Microcomputer Incorporating a LCD controller/Driver Circuit(帶LCD控制/驅(qū)動電路的微計算機)
HD4048412 4-Bit Single-Chip Microcomputer
HD4048412FS 4-Bit Single-Chip Microcomputer
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD4048212RFS 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a LCD controller/Driver Circuit
HD4048212RH 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a LCD controller/Driver Circuit
HD4048212RTF 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a LCD controller/Driver Circuit
HD4048212TF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD404828FS 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller