參數(shù)資料
型號: HD4074449
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微機(4位單片微計算機)
文件頁數(shù): 83/123頁
文件大?。?/td> 726K
代理商: HD4074449
HD404449 Series
83
Operating States:
The serial interface has the following operating states; transitions between them are
shown in figure 67.
STS wait state (serial interface 2 is in SM2A read wait state)
Transmit clock wait state
Transfer state
Continuous clock output state (only in internal clock mode)
The operation state of serial interface 2 is the same as serial interface 1 except that the STS instruction of
serial interface 1 changes to SM2A read. The following shows the operation state of serial interface 1.
STS wait state: The serial interface enters STS wait state by MCU reset (00, 10 in figure 67). In STS
wait state, serial interface 1 is initialized and the transmit clock is ignored. If the STS instruction is then
executed (01, 11), serial interface 1 enters transmit clock wait state.
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
SM1A write
04
STS instruction
01
Transmit clock
02
8 transmit clocks
03
STS instruction (IFS 1)
05
SM1A 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)
SM1A 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 = 00)
SM1A write
18
Transmit clock
17
16
Note: Refer to the Operating States section for the corresponding encircled numbers.
MCU reset
10
SM1A write (IFS 1)
Figure 67 Serial Interface State Transitions
Transmit clock wait state: Transmit clock wait state is the period between the STS execution and the
falling edge of the first transmit clock. In transmit clock wait state, input of the transmit clock (02, 12)
increments the octal counter, shifts serial data register 1 (SR1L: $006, SR1U: $007), and enters the
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