M38227ECFP Renesas Electronics America, M38227ECFP Datasheet - Page 32

• Manufacturer Part Number: M38227ECFP
• Description: IC 740 MCU EPROM 48K 80QFP
• Manufacturer: Renesas Electronics America
• Series: 740/38000r

Specifications of M38227ECFP

• Core Processor: 740
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SIO, UART/USART
• Peripherals: LCD
• Number Of I /o: 49
• Program Memory Size: 48KB (48K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

SERIAL I/O
Serial I/O can be used as either clock synchronous or asynchro-
nous (UART) serial I/O. A dedicated timer (baud rate generator) is
also provided for baud rate generation.
Fig. 25 Block diagram of clock synchronous serial I/O
Fig. 26 Operation of clock synchronous serial I/O function
(f(X
CIN
W r i t e s i g n a l t o r e c e i v e / t r a n s m i t
b u f f e r r e g i s t e r ( a d d r e s s 0 0 1 8
) in low-speed mode)
Transfer shift clock
(1/2 to 1/2048 of the internal
clock, or an external clock)
R e c e i v e e n a b l e s i g n a l S
P 4
P 4
P 4
P4
N o t e s 1 : T h e t r a n s m i t i n t e r r u p t ( T I ) c a n b e g e n e r a t e d e i t h e r w h e n t h e t r a n s m i t b u f f e r r e g i s t e r h a s e m p t i e d ( T B E = 1 ) o r a f t e r t h e t r a n s m i t
7
6
4
/ S
5
/ S
/ R
f ( X
/T
R D Y 1
C L K
X
X
I N
D
D
)
2 : I f d a t a i s w r i t t e n t o t h e t r a n s m i t b u f f e r r e g i s t e r w h e n T S C = 0 , t h e t r a n s m i t c l o c k i s g e n e r a t e d c o n t i n u o u s l y a n d s e r i a l d a t a i s
3 : T h e r e c e i v e i n t e r r u p t ( R I ) i s s e t w h e n t h e r e c e i v e b u f f e r f u l l f l a g ( R B F ) b e c o m e s “ 1 ” .
S e r i a l o u t p u t T
S e r i a l i n p u t R
s h i f t o p e r a t i o n h a s e n d e d ( T S C = 1 ) , b y s e t t i n g t h e t r a n s m i t i n t e r r u p t s o u r c e s e l e c t i o n b i t ( T I C ) o f t h e s e r i a l I / O c o n t r o l r e g i s t e r .
o u t p u t c o n t i n u o u s l y f r o m t h e T
BRG count source selection bit
F / F
R D Y
X
X
1 6
D
D
)
T B E = 0
1 / 4
Falling-edge detector
T B E = 1
T S C = 0
R e c e i v e b u f f e r r e g i s t e r
X
R e c e i v e s h i f t r e g i s t e r
D p i n .
D
D
0
0
D a t a b u s
T r a n s m i t s h i f t r e g i s t e r
Data bus
Transmit buffer register
Serial I/O
clock selection bit
Frequency division ratio 1/(n+1)
A d d r e s s 0 0 1 8
Shift clock
D
D
Baud rate generator
A d d r e s s 0 0 1 8
1
1
A d d r e s s 0 0 1 C
S h i f t c l o c k
D
1 6
D
2
2
(1) Clock Synchronous Serial I/O Mode
Clock synchronous serial I/O can be selected by setting the mode
selection bit of the serial I/O control register to “1”.
For clock synchronous serial I/O, the transmitter and the receiver
must use the same clock. If an internal clock is used, transfer is
started by a write signal to the transmit/receive buffer register.
1 6
C l o c k c o n t r o l c i r c u i t
1 6
Clock control circuit
S e r i a l I / O c o n t r o l r e g i s t e r
Transmit interrupt source selection bit
R e c e i v e b u f f e r f u l l f l a g ( R B F )
D
D
Serial I/O status register
3
3
1/4
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
D
D
R e c e i v e i n t e r r u p t r e q u e s t ( R I )
4
4
Transmit buffer empty flag (TBE)
MITSUBISHI MICROCOMPUTERS
T r a n s m i t s h i f t r e g i s t e r s h i f t c o m p l e t i o n f l a g ( T S C )
Transmit interrupt request (TI)
D
D
5
5
A d d r e s s 0 0 1 A
A d d r e s s 0 0 1 9
D
D
6
6
O v e r r u n e r r o r ( O E )
d e t e c t i o n
1 6
3822 Group
1 6
RBF = 1
TSC = 1
D
D
7
7
29