M38517F8FP Renesas Electronics America, M38517F8FP Datasheet - Page 25

• Manufacturer Part Number: M38517F8FP
• Description: MCU 8-Bit 740 CISC 32KB Flash 5V 42-Pin SSOP
• Manufacturer: Renesas Electronics America

Specifications of M38517F8FP

• Package: 42SSOP
• 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: Flash
• Number Of Programmable I/os: 34
• Interface Type: I2C-BUS
• On-chip Adc: 5-chx10-bit
• Operating Temperature: -20 to 85 °C
• Number Of Timers: 4

3851 Group
(2) Asynchronous Serial I/O (UART) Mode
Clock asynchronous serial I/O mode (UART) can be selected by
clearing the serial I/O1 mode selection bit (b6) of the serial I/O1
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. 20 Block diagram of UART serial I/O1
Rev.1.01
P2
P2
P2
6
/S
4
5
/R
/T
CLK1
Oct 15, 2003
X
X
X
D
D
IN
(Built-in 24 KB or more ROM)
ST detector
BRG count source selection bit
1/4
Character length selection bit
page 23 of 89
Character length selection bit
8 bits
7 bits
Serial I/O1 synchronous clock selection bit
OE
Address 0018
Receive buffer register
PE FE
Receive shift register
Frequency division ratio 1/(n+1)
ST/SP/PA generator
Data bus
Data bus
16
Transmit buffer register
Baud rate generator
Transmit shift register
SP detector
Address 001C
Address
Serial I/O1 control register
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 register, and receive data is read
from the receive buffer register.
The transmit buffer register 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.
1/16
16
Clock control circuit
0018
16
Receive interrupt request (RI)
Receive buffer full flag (RBF)
Transmit interrupt source selection bit
Serial I/O1 status register
Address 001A
1/16
Transmit buffer empty flag (TBE)
Transmit shift completion flag (TSC)
UART control register
Transmit interrupt request (TI)
16
Address
Address 001B
0019
16
16