M38027E8FP Renesas Electronics America, M38027E8FP Datasheet - Page 22

• 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

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, but the
Fig. 12 Block diagram of UART serial I/O
P4
P4
P4
6
/S
4
5
f(X
/R
/T
CLK1
X
X
IN
D
D
)
STdetector
BRG count source selection bit
1/4
Character length selection bit
Character length selection bit
7 bits
8 bits
Serial I/O1 synchronous clock selection bit
OE
Address 0018
PE FE
Receive shift register
Frequency division ratio 1/(n+1)
ST/SP/PA generator
Receive buffer
Data bus
Data bus
16
Baud rate generator
Transmit shift register
SP detector
Address 001C
Transmit buffer
Address
Serial I/O1 control register
1/16
two buffers have the same address in memory. Since the shift reg-
ister cannot be written to or read from directly, transmit data is
written to the transmit buffer, and receive data is read from the re-
ceive buffer.
The transmit buffer can also hold the next data to be transmitted,
and the receive buffer can hold a character while the next charac-
ter is being received.
16
Clock control circuit
0018
16
Receive buffer full flag (RBF)
Receive interrupt request (RI)
Transmit interrupt source selection bit
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Serial I/O1 status register
Address 001A
MITSUBISHI MICROCOMPUTERS
1/16
Transmit buffer empty flag (TBE)
Transmit shift completion flag (TSC)
UART control register
Transmit interrupt request (TI)
16
Address
Address 001B
3802 Group
0019
16
16
19