UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 366

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

15.4.2 3-wire serial I/O mode
interface.
serial input (SI1n) lines.
(1) Registers used
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The 3-wire serial I/O mode is used for connecting peripheral ICs and display controllers with a clocked serial
In this mode, communication is executed by using three lines: the serial clock (SCK1n), serial output (SO1n), and
• Serial operation mode register 1n (CSIM1n)
• Serial clock selection register 1n (CSIC1n)
• Port mode register 1 (PM1) or port mode register 7 (PM7)
• Port register 1 (P1) or port register 7 (P7)
<1> Set the CSIC1n register (see Figures 15-5 and 15-6).
<2> Set bits 0 and 4 to 6 (CSOT1n, DIR1n, SSE11 (serial interface CSI11 only), and TRMD1n) of the CSIM1n
<3> Set bit 7 (CSIE1n) of the CSIM1n register to 1. → Transmission/reception is enabled.
<4> Write data to transmit buffer register 1n (SOTB1n). → Data transmission/reception is started.
The basic procedure of setting an operation in the 3-wire serial I/O mode is as follows.
Caution Take relationship with the other party of communication when setting the port mode register
Remark n = 0, 1
register (see Figures 15-3 and 15-4).
Read data from serial I/O shift register 1n (SIO1n). → Data reception is started.
and port register.
CHAPTER 15 SERIAL INTERFACES CSI10 AND CSI11
User’s Manual U17554EJ4V0UD