ST18952 datasheet(43/67 Pages) STMICROELECTRONICS

43 / 67 page

43/66

ST18952

12.1 System registers

There are 4 system registers: CMR clock management register; PICR port/interrupt control

are Y memory-mapped.

PICR: Port/interrupt control register

The interrupt controller ITRQ inputs can be connected to external interrupt requests or to

internal peripheral requests, this is dependent on the setting of the port/interrupt control (PICR)

system register.

The interrupt controller receives interrupt requests from primary inputs P_ITRQ0-7 on its

inputs ITRQ0-7 when bit 0-7 of the PICR register is set to ‘0’. Otherwise, the ITRQ0-7 input is

connected to the internal peripheral interrupt request output. Each input can be programmed

independently.

(Address = 0049 h, Reset value = 0000 h, Read/Write)

Note: P_ITRQ0-7 primary I/Os are used for external interrupt requests and for the D950 8-bit

general purpose parallel port (P0-7). Depending on the PICR value and the programming of

TIM1 TIM0 DMA3 DMA2 DMA1 DMA0

Bit

Function

DMA0

0: ITC ITRQ0 connected to P_ITRQ0 primary I/O

1: ITC ITRQ0 connected to DMA DIT0 output

DMA1

0: ITC ITRQ1 connected to P_ITRQ1 primary I/O

1: ITC ITRQ1 connected to DMA DIT1 output

DMA2

0: ITC ITRQ2 connected to P_ITRQ2 primary I/O

1: ITC ITRQ2 connected to DMA DIT2 output

DMA3

0: ITC ITRQ3 connected to P_ITRQ3 primary I/O

1: ITC ITRQ3 connected to DMA DIT3 output

TIM0

0: ITC ITRQ4 connected to P_ITRQ4 primary I/O

1: ITC ITRQ4 connected to TIMER0 interrupt request output

TIM1

0: ITC ITRQ5 connected to P_ITRQ5 primary I/O

1: ITC ITRQ5 connected to TIMER1 interrupt request output

0: ITC ITRQ6 connected to P_ITRQ6 primary I/O

1: ITC ITRQ6 is not used (connected to VDD)

0: ITC ITRQ7 connected to P_ITRQ7 primary I/O

1: ITC ITRQ7 is not used (connected to VDD)

0: Normal mode.

1: ITC inhibited (bit 7-0 UNUSED).

D950Core IT input directly connected to P_ITRQ-7 primary I/O.

Bits15:9

UNUSED

ST18952 数据表(PDF) 43 Page - STMicroelectronics

ST18952 数据表(HTML) 43 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

数据表下载