UPD78F0138 NEC, UPD78F0138 Datasheet - Page 333

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

(1) Transmit buffer register 1n (SOTB1n)
(2) Serial I/O shift register 1n (SIO1n)
SI11/P03
SCK11/P04
Remark n = 0:
This register sets the transmit data.
Transmission/reception is started by writing data to SOTB1n when bit 7 (CSIE1n) and bit 6 (TRMD1n) of serial
operation mode register 1n (CSIM1n) is 1.
The data written to SOTB1n is converted from parallel data into serial data by serial I/O shift register 1n, and
output to the serial output pin (SO1n).
SOTB1n can be written or read by an 8-bit memory manipulation instruction.
RESET input clears this register to 00H.
Cautions 1. Do not access SOTB1n when CSOT1n = 1 (during serial communication).
This is an 8-bit register that converts data from parallel data into serial data and vice versa.
This register can be read by an 8-bit memory manipulation instruction.
Reception is started by reading data from SIO1n if bit 6 (TRMD1n) of serial operation mode register 1n (CSIM1n)
is 0.
During reception, the data is read from the serial input pin (SI1n) to SIO1n.
RESET input clears this register to 00H.
Cautions 1. Do not access SIO1n when CSOT1n = 1 (during serial communication).
f
f
f
f
f
f
X
X
X
X
X
X
f
X
/2
/2
/2
/2
/2
/2
/2
2
3
4
5
6
7
n = 0, 1:
2. The SSI11 pin can be used in the slave mode. For details of the transmission/reception
2. The SSI11 pin can be used in the slave mode. For details of the reception operation, see
Figure 15-2. Block Diagram of Serial Interface CSI11
operation, see 15.4.2 (2) Communication operation.
15.4.2 (2) Communication operation.
Transmit data
controller
µ
µ
PD780131, 780132
PD780133, 780134, 78F0134, 780136, 780138, 78F0138
Serial I/O shift
register 11 (SIO11)
(
Clock start/stop controller &
µ
CHAPTER 15 SERIAL INTERFACES CSI10 AND CSI11
PD780133, 780134, 78F0134, 780136, 780138, and 78F0138 Only)
clock phase controller
Transmit controller
8
Internal bus
Output latch
User’s Manual U16228EJ2V0UD
Transmit buffer
register 11 (SOTB11)
8
selector
Output
INTCSI11
Output latch
(P02)
PM02
SSI11
SO11/P02
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