M34282E2GP MITSUBISHI [Mitsubishi Electric Semiconductor], M34282E2GP Datasheet - Page 21

• Manufacturer Part Number: M34282E2GP
• Description: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

CLOCK CONTROL
The clock control circuit consists of the following circuits.
• System clock generating circuit
• Control circuit to stop the clock oscillation
• Control circuit to return from the RAM back-up state
System clock signal f(X
ceramic resonator. Connect this external circuit to pins X
X
A feedback resistor is built-in between X
ROM ORDERING METHOD
Please submit the information described below when ordering
Mask ROM.
(1) Mask ROM Order Confirmation Form
(2) Mark Specification Form
(3) Data to be written to ROM, in EPROM form (three identical
* For the mask ROM confirmation, refer to the “Mitsubishi MCU
Fig. 25 Clock control circuit structure
OUT
copies) or one floppy disk.
T e c h n i c a l
www.infomicom.maec.co.jp/indexe.htm).
at the shortest distance as shown Figure 26.
POF instruction
X
OUT
X
I N
I n f o r m a t i o n ”
IN
) is obtained by externally connecting a
S
R
Q
O S C
H o m e p a g e
IN
*
pin and X
F r e q u e n c y
d i v i d e r
( d i v i d e d b y 8 )
OUT
( h t t p : / /
pin.
IN
and
MITSUBISHI
ELECTRIC
C C K i n s t r u c t i o n
M u l t i -
p l e x e r
Fig. 26 Ceramic resonator external circuit
I n t e r n a l p o w e r - o n r e s e t c i r c u i t
C
P u l l - d o w n c o n t r o l
r e g i s t e r P U 0
Pull-down control
register 1
IN
STCK
X
4
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
IN
4282
I n t e r n a l c l o c k
g e n e r a t i o n c i r c u i t
( d i v i d e d b y 4 )
MITSUBISHI MICROCOMPUTERS
X
OUT
5
C
OUT
P o r t E
P o r t s E
Ports D
Use the resonator
manufacturer’s
recommended value
because constants
such as capacitance
depend on the
resonator.
2
4282 Group
0
4
, E
–D
1
INSTCK
, G
7
0
– G
3
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