參數(shù)資料
型號(hào)： SM5L3
廠商： SHARP ELECTRONICS CORP
元件分類(lèi)： 微控制器/微處理器
英文描述： 4-BIT, MROM, MICROCONTROLLER, PQFP80
封裝： 14 X 20 MM, PLASTIC, QFP-80
文件頁(yè)數(shù)： 6/27頁(yè)
文件大?。?/td> 164K
代理商： SM5L3
SM5L1/SM5L2/SM5L3
4-Bit Single Chip Microcomputers
14
Microcomputer Data Sheet
System Clock Generator and Dividers
The main oscillation frequency which is input
through OSCIN - OSCOUT or OSCIN - CK2 is divided
into two or four to generate the system clock fSYS. This
function is shown in Figure 19.
System clock fSYS determines the execution instruc-
tion cycle so that the system clock period is the same
as the instruction cycle.
However, the instruction execution cycle of two-
word instruction is twice that of one word instructions.
Use of a CR oscillating element or a crystal oscillating
element for the oscillator circuit is determined by the
mask option. The crystal oscillator which is input through
OSCIN - OSCOUT can be used as both real time clock
and display signal of LCD. On the final stage of the
divider, fc can be set to 1 Hz or 2 Hz (in case of 32 kHz
crystal oscillation) depending on the mask option.
Either of the system clock frequencies 16.384 kHz or
8.192 kHz (in case of 32.768 kHz oscillation) can be
selected by the RF2 flag (see Table 2). The 8.192 kHz
clock has slower command execution speed, but uses
less power for the same function.
The system clock is initialized to 16.384 kHz after
hardware reset operation.
Table 2 shows the relationship between the contents
of RF2 flag for the OSC resonator and the generated
frequency, fSYS.
Table 2. OSC Resonator and Frequency fSYS
FOR OSC RESONATOR
CONTENTS OF RF2 FLAG
GENERATED FREQUENCY fSYS
32.768 kHz crystal oscillation
0
16.384 kHz
1
8.192 kHz
40 kHz CR oscillation
020 kHz
110 kHz
Figure 19. System Clock Generator and Divider
OSCIN
OSCOUT
CK2
OSC
OSCIN - OSCOUT: Crystal
oscillation (32.768 kHz)
OSCIN - CK2: CR
oscillation (40 kHz)
1/2
1 Hz
2 Hz
fc = 1 Hz or 2 Hz
Determined by
mask option
fSYS
fSYS = 8.192 kHz or
16.384 kHz (crystal oscillation) or
fSYS = 10 kHz or 20 kHz (CR oscillation)
fc
f14 - - - - - - - - - - - - - - - - - - - - - - - - - - f0
DIVIDER
4 kHz 2 kHz
256 Hz
MPX.
RF2
CG
5L1-19
or
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