CH32V203中CAN测试模式中，静默环回模式需上电才能恢复是特性吗？

CH32V203 中 CAN 在测试模式中，比如开启静默环回模式。重新进入初始化模式，对寄存器 CAN_BtiMR 的 SILM 和 LBKM 位置0（寄存器置0成功），退出初始化模式，静默环回模式依旧存在，需重新上下电才能恢复，请问这是特性吗？

/* 官方程序 */
uint8_t CAN_Init(CAN_TypeDef* CANx, CAN_InitTypeDef* CAN_InitStruct)
{
uint8_t InitStatus = CAN_InitStatus_Failed;
uint32_t wait_ack = 0x00000000;

CANx->CTLR &= (~(uint32_t)CAN_CTLR_SLEEP);
CANx->CTLR |= CAN_CTLR_INRQ ;

while (((CANx->STATR & CAN_STATR_INAK) != CAN_STATR_INAK) && (wait_ack != INAK_TIMEOUT))
{
wait_ack++;
}

if ((CANx->STATR & CAN_STATR_INAK) != CAN_STATR_INAK)
{
InitStatus = CAN_InitStatus_Failed;
}
else
{
if (CAN_InitStruct->CAN_TTCM == ENABLE)
{
CANx->CTLR |= CAN_CTLR_TTCM;
}
else
{
CANx->CTLR &= ~(uint32_t)CAN_CTLR_TTCM;
}

if (CAN_InitStruct->CAN_ABOM == ENABLE)
{
CANx->CTLR |= CAN_CTLR_ABOM;
}
else
{
CANx->CTLR &= ~(uint32_t)CAN_CTLR_ABOM;
}

if (CAN_InitStruct->CAN_AWUM == ENABLE)
{
CANx->CTLR |= CAN_CTLR_AWUM;
}
else
{
CANx->CTLR &= ~(uint32_t)CAN_CTLR_AWUM;
}

if (CAN_InitStruct->CAN_NART == ENABLE)
{
CANx->CTLR |= CAN_CTLR_NART;
}
else
{
CANx->CTLR &= ~(uint32_t)CAN_CTLR_NART;
}

if (CAN_InitStruct->CAN_RFLM == ENABLE)
{
CANx->CTLR |= CAN_CTLR_RFLM;
}
else
{
CANx->CTLR &= ~(uint32_t)CAN_CTLR_RFLM;
}

if (CAN_InitStruct->CAN_TXFP == ENABLE)
{
CANx->CTLR |= CAN_CTLR_TXFP;
}
else
{
CANx->CTLR &= ~(uint32_t)CAN_CTLR_TXFP;
}

CANx->BTIMR = (uint32_t)((uint32_t)CAN_InitStruct->CAN_Mode << 30) |
((uint32_t)CAN_InitStruct->CAN_SJW << 24) |
((uint32_t)CAN_InitStruct->CAN_BS1 << 16) |
((uint32_t)CAN_InitStruct->CAN_BS2 << 20) |
((uint32_t)CAN_InitStruct->CAN_Prescaler - 1);
CANx->CTLR &= ~(uint32_t)CAN_CTLR_INRQ;
wait_ack = 0;

while (((CANx->STATR & CAN_STATR_INAK) == CAN_STATR_INAK) && (wait_ack != INAK_TIMEOUT))
{
wait_ack++;
}

if ((CANx->STATR & CAN_STATR_INAK) == CAN_STATR_INAK)
{
InitStatus = CAN_InitStatus_Failed;
}
else
{
InitStatus = CAN_InitStatus_Success ;
}
}

return InitStatus;
}