參數(shù)資料
型號: μPD784217
廠商: NEC Corp.
英文描述: 8 /16 Bit Single Chip Microcontrollers(8/16位單片微控制器)
中文描述: 8 / 16位單片機(jī)微控制器(8 / 16位單片微控制器)
文件頁數(shù): 43/70頁
文件大小: 271K
代理商: ΜPD784217
μ
PD784217,784218
43
8.7.2 Clocked serial interface (CSI)
In this mode, the master device starts transfer by making the serial clock active and communicates 1-byte data
in synchronization with this clock.
3-wire serial I/O mode
This mode is to communicate with devices having the conventional clocked serial interface.
Basically, communication is established in this mode with three lines: one serial clock (SCK0) and two serial
data (SI0 and SO0) lines.
Generally, a handshake line is necessary to check the reception status.
Figure 8-12. Block Diagram in 3-wire Serial I/O Mode
8
8
SI0
SO0
SCK0
INTCSI0
INTTM2
f
XX
/8
f
XX
/16
Internal bus
Direction control circuit
Interrupt
generation circuit
Selector
Serial clock
counter
Serial clock
control circuit
Serial I/O shift register 0
(SIO0)
8.8 Clock Output Function
Clocks of the following frequencies can be output as clock output.
97.7 kHz/195 kHz/391 kHz/781 kHz/1.56 MHz/3.13 MHz/6.25 MHz/12.5 MHz
(main system clock: 12.5 MHz)
32.768 kHz (subsystem clock: 32.768 kHz)
Figure 8-13. Block Diagram of Clock Output Function
f
XX
f
XX
/2
f
XX
/2
2
f
XX
/2
3
f
XX
/2
4
f
XX
/2
5
f
XX
/2
6
f
XX
/2
7
f
XT
Synchronization
circuit
Output control circuit
PCL
S
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