Datasheet

78K0/Kx2-L CHAPTER 16 SERIAL INTERFACES CSI10 AND CSI11
R01UH0028EJ0400 Rev.4.00 566
Sep 27, 2010
(2) Serial I/O shift register 1n (SIO1n)
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 signal generation clears this register to 00H.
Cautions 1. Do not access SIO1n when CSOT1n = 1 (during serial communication).
2. In the slave mode, reception is started when data is read from SIO11 with a low level input to the
SSI11 pin. For details on the reception operation, refer to 16.4.2 (2) Communication operation.
Remarks 1. 78K0/KA2-L (25, 32-pin products): n = 1
78K0/KB2-L: n = 0
78K0/KC2-L: n = 0, 1
2. The SSI11 pin is available only in 78K0/KA2-L (25, 32-pin products) and 78K0/KC2-L (48-pin products).
16.3 Registers Controlling Serial Interfaces CSI10 and CSI11
Serial interfaces CSI10 and CSI11 are controlled by the following five registers.
• Serial operation mode register 1n (CSIM1n)
• Serial clock selection register 1n (CSIC1n)
• Port alternate switch control register (MUXSEL)
• Port mode register x (PMx)
• Port register x (Px)
Remark 78K0/KA2-L (25, 32-pin products): n = 1, x = 0, 3
78K0/KB2-L: n = 0, x = 1
78K0/KC2-L: n = 0, 1, x = 1, 4, 6, 12
(1) Serial operation mode register 1n (CSIM1n)
CSIM1n is used to select the operation mode and enable or disable operation.
CSIM1n can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Remark 78K0/KA2-L (25, 32-pin products): n = 1
78K0/KB2-L: n = 0
78K0/KC2-L: n = 0, 1