參數(shù)資料
型號(hào)： UPD17149GTA1
廠商： NEC Corp.
英文描述： SMALL, GENERAL-PURPOSE 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 小，通用4位單晶片微控制器
文件頁(yè)數(shù)： 53/102頁(yè)
文件大?。?/td> 408K
代理商： UPD17149GTA1
53
μ
PD17145(A1), 17147(A1), 17149(A1)
(2) 8-bit reception mode (SO pin: high-impedance state)
The P0D
1
/SO pin goes into a high-impedance state when SIOHIZ = 1. If supply of the serial clock is started
at this time by writing “1” to SIOTS, the serial interface only receives data.
Because the P0D
1
/SO pin goes into a high-impedance state, it can be used as an input port pin (P0D
1
).
Figure 15-3. Timing in 8-Bit Reception Mode
Remark
DI: serial data input
(3) Operation stop mode
When the value of SIOTS (RF: address 02H, bit 3) is 0, the serial interface is set in the operation stop mode.
In this mode, serial transfer is not executed.
Because the shift register does not perform the shift operation in this mode, it can be used as an ordinary
8-bit register.
1
2
3
4
5
6
7
8
DI7
DI6
DI5
DI4
DI3
DI2
DI1
DI0
SCK pin
SI pin
SO pin
IRQSIO
Hi - Z
Starts transfer in synchronization with falling of SCK pin
Executes instruction that writes "1" to SIOTS (transfer start command)
End of transfer
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