概述
TAUJ定时器为RH850较为常用的定时器：
（1）定时器计时是通过计数来实现的，定时器内部有一个计数器，这个计数器根据时钟（这个时钟来自于ARM的APB总线）来工作。每隔一个时钟周期，计数器就就计数一次，定时器的时间=计数器计数值x时钟周期。
（2）定时器内部有计数器，计时开始时我们会把一个总的计数值放入计数器中，然后每隔一个时钟周期计数器中的值会自动减1（硬件自动完成，不需要CPU软件去干预），当计数器的值减为0的时候，就会触发定时器中断。最后的计时时间就是设定值。
（3）定时时间是由2个东西共同决定的：一个是计数器中的计数值，一个是时钟周期。
- TAUJ Timer定时器寄存器介绍
1.1、TAUJn 时钟预分频选择寄存器Prescaler Clock Select Register
| Bit position | Bit Name | Function |
| 15 - 12 | TAUJnPRS3 | 指定CK3_PRE时钟。 |
| 11 - 8 | TAUJnPRS2 | 指定CK2_PRE时钟。 |
| 7 - 4 | TAUJnPRS1 | 指定CK1_PRE时钟。 |
| 3 - 0 | TAUJnPRS0 | 指定CK0_PRE时钟。 |
1.2、TAUJn 通道数据寄存器 Channel Data Register
| Bit position | Bit Name | Function |
| 31 - 0 | TAUJnCDR | 用于捕获/比较值的数据寄存器 |
1.3、TAUJn 通道模式操作系统寄存器Channel Mode OS Register
| Bit position | Bit Name | Function |
| 15、14 | TAUJnCKS | 选择一个操作时钟，该时钟与TAUJTTINm输入一起使用检测电路。 设置TAUJnCMORm。TAUJnCCS[1:0]位允许操作时钟 作为TAUJnCNTm计数器。 |
| 13、12 | TAUJnCCS | 为TAUJnCNTm选择一个计数时钟。 |
| 11 | TAUJnMAS | 指定同步期间通道是主通道还是从通道 通道操作。 0:从 1:主 (此位设置仅对偶数通道有效) |
| Bit position | Bit Name | Function |
| 10 to 8 | TAUJnSTS | 选择外部中断触发器。 |
| Bit position | Bit Name | Function |
| 7、6 | TAUJnCOS | 指定捕获寄存器TAUJnCDRm和溢出的时间 TAUJnCSRm。这些位只在通道m用于捕获功能(捕获模式和捕获一次计数模式)。 |
| Bit position | Bit Name | Function |
| 4 to 0 | TAUJnMD | 选择运行模式。 |
1.4、TAUJn 通道模式使用寄存器 Channel Mode User Register
| Bit position | Bit Name | TIS1 | TISO | Function |
| 1，0 | TAUJnTIS | 0 | 0 | 下降沿 |
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| 0 | 1 | 上升沿 |
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| 1 | 0 | 下降边缘和上升边缘的检测(选择低宽度 测量) 开始触发:下降边缘 停止触发(捕获):上升边缘 |
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| 1 | 1 | 下降边缘和上升边缘的检测(选择高宽度 测量) 启动触发器:上升边缘 停止触发(捕获):下降边缘 |
1.5、TAUJn通道重新加载数据启用寄存器 Channel Reload Data Enable Register
| Bit position | Bit Name | Function |
| 3 to 0 | TAUJnRDEm | 0：禁用同时重写 1：开启同时重写 |
1.6、TAUJn通道重新加载数据模式寄存器 Channel Reload Data Mode Register
| Bit position | Bit Name | Function |
| 3 to 0 | TAUJnRDMm | 0:当主频道计数器开始计数时 1：无效 |
例程：
void R_TAUJ_Init( void )
{
uint32_t reg32_value;
/* Source Clock Setting for C_AWO_TAUJ
CKSC_ATAUJS_CTL - C_AWO_TAUJ Source Clock Selection Register
b31:b 2 - Reserved set to 0
b 1:b 0 ATAUJSCSID - Source Clock Setting for C_AWO_TAUJ - HS IntOSC fRH (8MHz) */
do
{
reg32_value = 0x00000001UL;
WPROTRPROTCMD0 = 0x000000A5UL; /* Protection release the CKSC_ATAUJS_CTL register. */
CLKCTLCKSC_ATAUJS_CTL = reg32_value;
CLKCTLCKSC_ATAUJS_CTL = ~reg32_value;
CLKCTLCKSC_ATAUJS_CTL = reg32_value;
} while ( PORTPPROTS0 != 0x00000000UL );
while( CLKCTLCKSC_ATAUJS_ACT != reg32_value )
{
/* Waiting for CKSC_ATAUJS_CTL to set. */
}
/* Clock Divider Setting for C_AWO_TAUJ
CKSC_ATAUJD_CTL - C_AWO_TAUJ Divided Clock Selection Register
b31:b 2 - Reserved set to 0
b 1:b 0 ATAUJDCSID - Clock Divider Setting for C_AWO_TAUJ - CKSC_ATAUJS_CTL selection / 1 */
do
{
reg32_value = 0x00000001UL;
WPROTRPROTCMD0 = 0x000000A5UL; /* Protection release the CKSC_ATAUJD_CTL register. */
CLKCTLCKSC_ATAUJD_CTL = reg32_value;
CLKCTLCKSC_ATAUJD_CTL = ~reg32_value;
CLKCTLCKSC_ATAUJD_CTL = reg32_value;
} while ( PORTPPROTS0 != 0x00000000UL );
while( CLKCTLCKSC_ATAUJD_ACT != reg32_value )
{
/* Waiting for CKSC_ATAUJD_CTL to set. */
}
/* Set interrupt flags */
INTC2MKTAUJ0I0 = 1U;
INTC2RFTAUJ0I0 = 0U;
INTC2TBTAUJ0I0 = 1U;
/* Set the clock stop mask and select the clock domains to be stopped and to continue operating.
CKSC_ATAUJD_STPM - C_AWO_TAUJ Stop Mask Register
b31:b 1 - When read, the value after reset is returned. When writing to these bits,
write the value after reset.
b 0 ATAUJDSTPMSK - Clock domain C_AWO_TAUJ is not stopped in stand-by mode. Set to 1'b. */
CLKCTLCKSC_ATAUJD_STPM = 0x00000003UL;
/* Specifies the CK3 , CK2 , CK1 and CK0 clock
TAUJnTPS - TAUJn Prescaler Clock Select Register
b15:b12 TAUJnPRS3 - Specifies CK3_PRE clock - PCLK / 1
b11:b 8 TAUJnPRS2 - Specifies CK2_PRE clock - PCLK / 1
b 7:b 4 TAUJnPRS1 - Specifies CK1_PRE clock - PCLK / 1
b 3:b 0 TAUJnPRS0 - Specifies CK0_PRE clock - PCLK / 1 */
TAUJ0TPS = 0x0000U; /* HS IntOsc fRH(8MHz) / 1 */
/* Data register for the capture/compare value
TAUJnCDRm - TAUJn Channel Data Register
b31:b 0 TAUJnCDR - Data register for capture/compare values - 1ms */
TAUJ0CDR0 = 8000UL - 1UL; /* INTTAUJnIm cycle = count clock cycle * (TAUJnCDRm + 1) */
/* Controls master channel operation
TAUJnCMORm - TAUJn Channel Mode OS Register
b15:b14 TAUJnCKS - Selects an operation clock. - Selected Operation CK0
b13:b12 TAUJnCCS0 - Selects a count clock for TAUJnCNTm counter. - Set to 00'b
b11 TAUJnMAS - Specifies whether the channel is a master
channe or slave channel during synchronous
channel operation. - Set to 0'b
b10:b 8 TAUJnSTS - Selects an external start trigger. - Set to 000'b
b 7:b 6 TAUJnCOS - Specifies the timing for updating capture
register TAUJnCDRm and overflow flag
TAUJnCSRm.TAUJnOVF of channel m. - Set to 00'b.
b 5 - Reserved set to 0
b 4:b 1 TAUJnMD - Specifies an operating mode. - Interval timer mode. Set to 0000'b
b 0 TAUJnMD0 - Specifies whether INTTAUJnIm is generated
at the beginning of count operation (when
a start trigger is entered) or not. - INTTAUDnIm is not generated.
Set to 0'b */
TAUJ0CMOR0 = 0x0000U;
/* Specifies the type of valid edge detection used for the TAUJTTINm input.
TAUJnCMURm - TAUJn Channel Mode User Register
b 7:b 2 - Reserved set to 0
b 1:b 0 TAUJnTIS - Specifies a valid edge of TAUJTTINm input
signal. - Unused. Set to 00'b. */
TAUJ0CMUR0 = 0x00U;
/* TAUJnTOE.TAUJnTOEm is set to 0 because the channel output mode is not used by this samples. */
TAUJ0TOE &= 0xFEU;
/* Unused TAUJnRDE, TAUJnRDM registers in interval timer function. */
/* These registers set "0". */
TAUJ0RDE &= 0xFEU;
TAUJ0RDM &= 0xFEU;
}
最后
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