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參數(shù)資料
| 型號： | HD4074459 |
| 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)： | 68/120頁 |
| 文件大?。?/td> | 692K |
| 代理商： | HD4074459 |
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HD404459 Series
68
Timer C Operations:
Free-running/reload timer operation: The free-running/reload operation, input clock source, and
prescaler division ratio are selected by timer mode register C1 (TMC1: $00D).
Timer C is initialized to the value set in timer write register C (TWCL: $00E, TWCU: $00F) by
software and incremented by one at each clock input. If an input clock is applied to timer C after it has
reached $FF, an overflow is generated. In this case, if the reload timer function is enabled, timer C is
initialized to its initial value set in timer write register C; if the free-running timer function is enabled,
the timer is initialized to $00 and then incremented again.
The overflow sets the timer C interrupt request flag (IFTC: $003, bit 0). IFTC can be reset by software
or MCU reset. Refer to figure 3 and table 1 for details.
Watchdog timer operation: Timer C is used as a watchdog timer for detecting out-of-control program
routines by setting the watchdog on flag (WDON: $020, bit 1) to 1. If a program routine runs out of
control and an overflow is generated, the MCU is reset. Program run can be controlled by initializing
timer C by software before it reaches $FF.
Timer output operation: The following four output modes can be selected for timer C by setting timer
mode register C2 (TMC2: $014).
Toggle
0 output
1 output
PWM output
By selecting the timer output mode, pin R3
1
/TOC is set to TOC. The output from TOC is reset low by
MCU reset.
Toggle output: The operation is basically the same as that of timer-B’s toggle output.
0 output: The operation is basically the same as that of timer-B’s 0 output.
1 output: The operation is basically the same as that of timer-B’s 1 output.
PWM output (figure 44): When PWM output mode is selected, timer C provides the variable-duty
pulse output function. The output waveform differs depending on the contents of timer mode
register C1 (TMC1: $00D) and timer write register C (TWCL: $00E, TWCU: $00F).
Registers for Timer C Operation:
By using the following registers, timer C operation modes are selected
and the timer C count is read and written.
Timer mode register C1 (TMC1: $00D)
Timer mode register C2 (TMC2: $014)
Timer write register C (TWCL: $00E, TWCU: $00F)
Timer read register C (TRCL: $00E, TRCU: $00F)
Timer mode register C1 (TMC1: $00D): Four-bit write-only register that selects the free-running/ reload
timer function, input clock source, and prescaler division ratio (figure 53). It is reset to $0 by MCU
reset.
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