參數(shù)資料
型號: HD404639R
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 81/133頁
文件大小: 803K
代理商: HD404639R
HD404639R Series
81
Selector
Prescaler S (PSS)
÷
2
÷
8
÷
3
÷
1
÷
5
÷
2
S
I/O control
logic
Idle control
logic
Octal counter
(OC1, OC2)
Serial interrupt
request flag
(IFS1, IFS2)
Clock
Serial data
register (SR1L/U,
SR2L/U)
Serial mode register
1A, 2A (SM1A,
SM2A)
Serial mode register
1B, 2B (SM1B,
SM2B)
Transfer
control
SO , SO
SCK
,
SCK
1
SI , SI
System
clock
I
3
PER
1/2
1/2
2
2
2
Figure 66 Block Diagram of Serial Interface Serial Interface Operation
Serial Interface Operation
Selecting and Changing the Operating Mode:
Tables 26 (A) and 26 (B) list the serial interfaces’
operating modes. To select an operating mode, use one of these combinations of port mode register A
(PMRA: $004), serial mode register 1A (SM1A: $005), and serial mode register 2A (SM2A: $01B)
settings; to change the operating mode of serial interface 1, always initialize the serial interface internally
by writing data to serial mode register 1A; and to change the operating mode of serial interface 2, always
initialize the serial interface internally by writing data to serial mode register 2A. Note that serial interface
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