M38227ECFP Renesas Electronics America, M38227ECFP Datasheet - Page 33

• 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: -

(2) Asynchronous Serial I/O (UART) Mode
Clock asynchronous serial I/O mode (UART) can be selected by
clearing the serial I/O mode selection bit of the serial I/O control
register to “0”.
Eight serial data transfer formats can be selected, and the transfer
formats used by a transmitter and receiver must be identical.
The transmit and receive shift registers each have a buffer regis-
30
Fig. 27 Block diagram of UART serial I/O
Fig. 28 Operation of UART serial I/O function
Transmit buffer write signal
( f ( X
R e c e i v e b u f f e r r e a d s i g n a l
T r a n s m i t o r r e c e i v e c l o c k
C I N
N o t e s
) i n l o w - s p e e d m o d e )
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
1 : E r r o r f l a g d e t e c t i o n o c c u r s a t t h e s a m e t i m e t h a t t h e R B F f l a g b e c o m e s “ 1 ” ( a t 1 s t s t o p b i t , d u r i n g r e c e p t i o n ) .
2 : 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 s e l e c t e d t o o c c u r w h e n e i t h e r t h e T B E o r T S C f l a g b e c o m e s “ 1 ” b y t h e s e t t i n g o f 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
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 B F f l a g b e c o m e s “ 1 ” .
4 : A f t e r 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 = 1 , 0 . 5 t o 1 . 5 c y c l e s o f t h e d a t a s h i f t c y c l e i s n e c e s s a r y u n t i l c h a n g i n g t o T S C = 0 .
P 4
P4
P4
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 .
6
4
5
/ S
f ( X
/R
/T
C L K
X
X
I N
D
D
)
X
X
D
D
S T d e t e c t o r
BRG count source selection bit
1/4
T B E = 0
C h a r a c t e r l e n g t h s e l e c t i o n b i t
Character length selection bit
T S C = 0
T B E = 1
S e r i a l I / O s y n c h r o n o u s c l o c k s e l e c t i o n b i t
7 bits
8 b i t s
ST
S T
OE
A d d r e s s 0 0 1 8
D
D
0
0
P E F E
R e c e i v e b u f f e r r e g i s t e r
Receive shift register
T B E = 0
F r e q u e n c y d i v i s i o n r a t i o 1 / ( n + 1 )
S T / S P / P A g e n e r a t o r
D
D
1
1
1 s t a r t b i t
7 o r 8 d a t a b i t s
1 o r 0 p a r i t y b i t
1 o r 2 s t o p b i t ( s )
D a t a b u s
Data bus
1 6
Baud rate generator
Transmit shift register
Transmit buffer register
S P d e t e c t o r
Address 001C
A d d r e s s 0 0 1 8
Serial I/O control register
1/16
16
ter, but the two buffers have the same address in memory. Since
the shift register cannot be written to or read from directly, transmit
data is written to the transmit buffer, and receive data is read from
the receive buffer.
The transmit buffer can also hold the next data to be transmitted,
and the receive buffer register can hold a character while the next
character is being received.
Clock control circuit
Receive buffer full flag (RBF)
Receive interrupt request (RI)
1 6
SP
R B F = 1
S P
Transmit interrupt source selection bit
TBE=1
Serial I/O status register
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
ST
ST
A d d r e s s 0 0 1 A
D
1 / 1 6
D
0
MITSUBISHI MICROCOMPUTERS
Transmit buffer empty flag (TBE)
0
Transmit shift register shift completion flag (TSC)
UART control register
R B F = 0
Transmit interrupt request (TI)
D
D
1
Generated at 2nd bit in 2-stop-bit mode
1
1 6
Address 0019
Address 001B
3822 Group
16
16
SP
TSC=1
RBF=1
SP