參數(shù)資料
型號： S1C88848D0A0100
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, UUC192
封裝： DIE-192
文件頁數(shù)： 105/174頁
文件大小： 1304K
代理商： S1C88848D0A0100
28
EPSON
S1C88848 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Oscillation Circuits)
5.3.7 Programming notes
(1) When the high speed CPU operation is not
necessary, you should operate the peripheral
circuits according to the setting outline indicate
below.
CPU operating clock
OSC1
OSC3 oscillation circuit
OFF (When the OSC3 clock is not necessary
for some peripheral circuits.)
(2) Since several 100 sec to several 10 msec are
necessary for the oscillation to stabilize after
turning the OSC3 oscillation circuit ON.
Consequently, you should switch the CPU
operating clock (OSC1
→ OSC3) after allowing
for a sufficient waiting time once the OSC3
oscillation goes ON. (The oscillation start time
will vary somewhat depending on the oscillator
and on the externally attached parts. Refer to
the oscillation start time example indicated in
Chapter 7, "ELECTRICAL CHARACTERIS-
TICS".)
(3) When switching the clock from OSC3 to OSC1,
be sure to switch OSC3 oscillation OFF with
separate instructions. Using a single instruction
to process simultaneously can cause a malfunc-
tion of the CPU.
5.3.6 Control of oscillation circuit
Table 5.3.6.1 shows the control bits for the oscillation circuits.
Table 5.3.6.1 Oscillation circuit control bits
SR R/W
10
00FF02 D7
D6
D5
D4
D3
D2
D1
D0
EBR
WT2
WT1
WT0
CLKCHG
OSCC
VD1C1
VD1C0
0
1
0
R/W
1
OSC3
On
1
Address Bit
Name
Function
Comment
Reserved register
0
OSC1
Off
0
General-purpose register
CPU operating clock switch
OSC3 oscillation On/Off control
General-purpose register
OSCC: 00FF02HD2
Controls the ON and OFF settings of the OSC3
oscillation circuit.
When "1" is written: OSC3 oscillation ON
When "0" is written: OSC3 oscillation OFF
Reading:
Valid
When the CPU and some peripheral circuits
(output port, serial interface, programmable timer
and remote controller) are to be operated at high
speed, OSCC is to be set to "1". At all other times, it
should be set to "0" in order to reduce current
consumption.
At initial reset, OSCC is set to "1" (OSC3 oscillation
ON).
CLKCHG: 00FF02HD3
Selects the operating clock for the CPU.
When "1" is written: OSC3 clock
When "0" is written: OSC1 clock
Reading:
Valid
When the operating clock for the CPU is switched
to OSC3, CLKCHG should be set to "1" and when
the clock is switched to OSC1, CLKCHG should be
set to "0".
At initial reset, CLKCHG is set to "1" (OSC3 clock).
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