M38027E8FP Renesas Electronics America, M38027E8FP Datasheet - Page 21

• Manufacturer Part Number: M38027E8FP
• Description: MCU 8-Bit 740 CISC 32KB EPROM 5V 64-Pin PQFP
• Manufacturer: Renesas Electronics America

Specifications of M38027E8FP

• Package: 64PQFP
• Family Name: 740
• Maximum Speed: 8 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Program Memory Type: EPROM
• On-chip Adc: 8-chx8-bit
• On-chip Dac: 2-chx8-bit
• Operating Temperature: -20 to 85 °C
• Number Of Timers: 4

Serial I/O1
Serial I/O1 can be used as either clock synchronous or asynchro-
nous (UART) serial I/O. A dedicated timer is also provided for
baud rate generation.
Fig. 10 Block diagram of clock synchronous serial I/O1
Fig. 11 Operation of clock synchronous serial I/O1 function
18
Write pulse to receive/transmit
buffer (address 0018
Receive enable signal S
Transfer shift clock
(1/2 to 1/2048 of the internal
clock, or an external clock)
P4
P4
P4
P4
7
6
Notes 1 : The transmit interrupt (TI) can be selected to occur either when the transmit buffer has emptied (TBE=1) or after the
/S
/S
4
5
f(X
/R
/T
X
RDY1
CLK1
IN
X
IN
X
D
D
)
2 : If data is written to the transmit buffer when TSC=0, the transmit clock is generated continuously and serial data is
3 : The receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes “1” .
Serial output TxD
Serial input RxD
control register.
output continuously from the TxD pin.
transmit shift operation has ended (TSC=1), by setting the transmit interrupt source selection bit (TIC) of the serial I/O1
BRG count source selection bit
16
)
F/F
RDY1
TBE = 0
1/4
Falling-edge detector
TBE = 1
TSC = 0
Receive shift register
D
D
Receive buffer
0
0
Transmit shift register
Data bus
Data bus
Transmit buffer
D
D
Address 0018
Shift clock
Serial I/O1 synchronous
clock selection bit
Frequency division ratio 1/(n+1)
1
1
Baud rate generator
Address 0018
Shift clock
Address 001C
D
D
2
2
Clock synchronous serial I/O mode
Clock synchronous serial I/O1 mode can be selected by setting
the mode selection bit of the serial I/O1 control register to “1”.
For clock synchronous serial I/O1, 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 TB/RB (address 0018
16
16
Clock control circuit
Clock control circuit
16
D
D
3
3
Serial I/O1 control register
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Transmit interrupt source selection bit
Receive buffer full flag (RBF)
Serial I/O1 status register
1/4
D
D
4
4
MITSUBISHI MICROCOMPUTERS
Receive interrupt request (RI)
Transmit buffer empty flag (TBE)
D
D
Transmit shift completion flag (TSC)
5
5
Transmit interrupt request (TI)
Address 001A
D
D
6
6
Address 0019
3802 Group
Overrun error (OE)
detection
RBF = 1
TSC = 1
D
D
7
7
16
16
16
).