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參數(shù)資料
| 型號(hào)： | μPD789415 |
| 廠商： | NEC Corp. |
| 英文描述： | 8 Bit Single Chip Microcontrollers(8位單片微控制器) |
| 中文描述： | 8位單片機(jī)微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 36/126頁 |
| 文件大小： | 590K |
| 代理商： | ΜPD789415 |
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36
μ
PD789415, 789416, 789417
(1) 16-bit compare register 5 (CR50)
A value specified in CR50 is compared with the count in 16-bit timer register 5 (TM5). If they match, an interrupt
request (INTTM5) is issued.
CR50 is set using an 8-bit or 16-bit memory manipulation instruction. Any value from 0000H to FFFFH can be
set.
A RESET input loads FFFFH into CR50.
Cautions 1. CR50 is designed to be manipulated using a 16-bit memory manipulation instruction. It
can also be manipulated using 8-bit memory manipulation instructions, however. When
an 8-bit memory manipulation instruction is used to set CR50, it must be in a direct
addressing access mode.
2. To re-set CR50 during count operation, it is necessary to disable interrupts in advance,
using an interrupt mask flag register (MK1). It is also necessary to disable inversion of
the timer output data, using 16-bit timer mode control register 5 (TMC5).
(2) 16-bit timer register 5 (TM5)
TM5 is used to count the number of pulses.
The contents of TM5 are read using an 8-bit or 16-bit memory manipulation instruction.
A RESET input clears TM5 to 0000H.
Cautions 1. The count becomes undefined when STOP mode is deselected, because the count
operation is performed before oscillation settles.
2. TM5 is designed to be manipulated using a 16-bit memory manipulation instruction. It
can also be manipulated using 8-bit memory manipulation instructions, however. When
an 8-bit memory instruction is used to manipulate TM5, it must be in a direct addressing
access mode.
3. When an 8-bit memory manipulation instruction is used to manipulate TM5, the lower and
upper bytes must be read as a pair, in this order.
(3) 16-bit capture register 5 (TCP5)
TCP5 captures the contents of 16-bit timer 5 (TM5).
It is set using an 8-bit or 16-bit memory manipulation instruction.
A RESET input makes TCP5 undefined.
Caution
TCP5 is designed to be manipulated using a 16-bit memory manipulation instruction. It can
also be manipulated using 8-bit memory manipulation instructions, however. When an 8-bit
memory manipulation instruction is used to manipulate TCP5, it must be in a direct
addressing access mode.
(4) 16-bit counter read buffer
This buffer is used to latch and hold the count for 16-bit timer 5 (TM5).
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