M38517F8FP Renesas Electronics America, M38517F8FP Datasheet - Page 24

• 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
SERIAL I/O
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. 18 Block diagram of clock synchronous serial I/O1
Fig. 19 Operation of clock synchronous serial I/O1 function
Rev.1.01
SERIAL I/O1
Write pulse to receive/transmit
buffer register (address 0018
Receive enable signal S
Transfer shift clock
(1/2 to 1/2048 of the internal
clock, or an external clock)
P2
Notes 1: As the transmit interrupt (TI), either when the transmit buffer has emptied (TBE=1) or after the transmit shift operation has
7
/CNTR
Oct 15, 2003
P2
(Built-in 24 KB or more ROM)
P2
P2
2: If data is written to the transmit buffer register when TSC=0, the transmit clock is generated continuously and serial data
3: The receive interrupt (RI) is set when the receive buffer full flag (RBF) becomes “1” .
Serial output TxD
0
6
Serial input RxD
/S
/S
4
5
ended (TSC=1), by setting the transmit interrupt source selection bit (TIC) of the serial I/O1 control register.
is output continuously from the TxD pin.
/R
/T
RDY1
CLK1
X
X
X
IN
D
D
RDY1
BRG count source selection bit
page 22 of 89
16
F/F
)
TBE = 0
1/4
Falling-edge detector
TBE = 1
TSC = 0
D
D
Receive buffer register
0
0
Receive shift register
Transmit buffer register
Transmit shift register
Data bus
Data bus
D
D
1
1
Address 0018
Shift clock
Serial I/O1 synchronous
clock selection bit
Frequency division ratio 1/(n+1)
Baud rate generator
Address 0018
Shift clock
Address 001C
D
D
2
2
(1) Clock Synchronous Serial I/O Mode
Clock synchronous serial I/O mode can be selected by setting the
serial I/O1 mode selection bit of the serial I/O1 control register (bit
6 of address 001A
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 TB/RB.
16
16
Clock control circuit
Clock control circuit
D
D
16
3
3
Serial I/O1 control register
Transmit interrupt source selection bit
Receive buffer full flag (RBF)
Serial I/O1 status register
1/4
D
D
16
4
4
) to “1”.
Receive interrupt request (RI)
D
D
Transmit buffer empty flag (TBE)
Transmit shift completion flag (TSC)
5
5
Transmit interrupt request (TI)
Address 001A
D
D
Address 0019
6
6
Overrun error (OE)
detection
RBF = 1
TSC = 1
D
D
16
7
7
16