tmp88cu74 TOSHIBA Semiconductor CORPORATION, tmp88cu74 Datasheet - Page 103

• Manufacturer Part Number: tmp88cu74
• Description: Cmos 8-bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

INTSIO1
2.11 Serial Interface (SIO1)
2.11.1
2.11.2
interrupt request
has an 8-byte transmit and receive data buffer that can automatically and continuously
transfer up to 64 bits of data.
(
interface pins, the output latches of these pins should be set to “1” and set to input mode by
P0CR. In the transmit mode, pins P01 can be used as normal I/O ports, and in the receive mode,
the pins P02 can be used as normal I/O ports.
SIO control/status registers
SIO1CR1/SIO1SR
SCK1
The TMP88CU74 has clocked-synchronous 8-bit serial interfaces (SIO1). The serial interface
The serial interface is connected to external devices via pins P02 (SO1), P01 (SI1), P00
Configuration
Control
serial interface status can be determined by reading SIO1 status register (SIO1SR).
The data buffer is assigned to addresses 0FF8H to 0FFFH for SIO1 in the DBR area, and
can continuously transfer up to 8 words (bytes or nibbles) at one time. When the specified
number of words has been transferred, a buffer empty (in the transmit mode) or a buffer
full (in the receive mode or transmit/receive mode) interrupt (INTSIO1) is generated.
transmit/receive mode, a fixed interval wait can be applied to the serial clock for each word
transferred. Four different wait times can be selected with WAIT (bits 4 and 3 in
SIO1CR2).
The serial interface is controlled by SIO1 control registers (SIO1CR1/SIO1CR2). The
The transmit and receive data buffer is controlled by the BUF (bits 2 to 0 in SIO1CR2).
When the internal clock is used as the serial clock in the 8-bit receive mode and the 8-bit
) for SIO1. The serial interface pins are also used as port P0. When used as serial
Control Circuit
Shift clock
Figure 2.11.1 Serial Interface
SIO1CR2
Buffer control
Shift register
88CU74-103
circuit
7
8-bit transfer
6
5
Serial clock
Transmit and receive data
4
8 byte in DBR
buffer
3
CPU
4-bit transfer
2
1
0
SO1
Serial data output
SI1
Serial data input
Serial clock
input/output
SCK
1
TMP88CU74
2007-10-19
2003-02-17