參數(shù)資料
型號(hào): HD4074459
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位HMCS400系列微機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 84/120頁
文件大?。?/td> 692K
代理商: HD4074459
HD404459 Series
84
Operating States:
The serial interface has the following operating states, which allow transitions to occur
between them (figure 68).
STS wait state
Transmit clock wait state
Transfer state
Continuous clock output state (only in internal clock mode)
STS wait state
(Octal counter = 000,
transmit clock disabled)
Transmit clock wait state
(Octal counter = 000)
Trans
fer
state
(Octal counter = 000)
MCU reset
00
SMRA write
04
STS instruction
01
Transmit clock
02
8 transmit clocks
03
STS instruction (IFS 1)
05
SMRA write (IFS 1)
06
External clock mode
STS wait state
(Octal counter = 000,
transmit clock disabled)
Transmit clock wait state
(Octal counter = 000)
Transfer state
(Octal counter = 000)
SMRA write
14
STS instruction
11
Transmit clock
12
15
STS instruction (IFS 1)
8 transmit clocks
13
Internal clock mode
Continuous clock output state
(PMRA 0, 1 = 0, 0)
SMRA write
18
Transmit clock
17
16
Note: Refer to the Operating States section for the explanations on the corresponding encircled numbers.
MCU reset
10
SMRA write (IFS 1)
Figure 68 Serial Interface State Transitions
STS wait state: The serial interface enters STS wait state by MCU reset (00 and 10 in figure 68). In STS
wait state, the serial interface is initialized and the transmit clock is ignored. If the STS instruction is
then executed (01 and 11), the serial interface enters transmit clock wait state.
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