PC912XDP512F0CFVR datasheet(927/1348 Pages) FREESCALE

927 / 1348 page

23.0.5.14 IRQ Control Register (IRQCR)

Read: See individual bit descriptions below.

Write: See individual bit descriptions below.

NCLKX2

No ECLKX2 — This bit controls the availability of a free-running clock on the ECLKX2 pin. This clock has a ﬁxed

rate of twice the internal bus clock. Clock output is always active in emulation modes and if enabled in all other

operating modes.

0 ECLKX2 is enabled

1 ECLKX2 is disabled

1–0

EDIV[1:0]

Free-Running ECLK Divider — These bits determine the rate of the free-running clock on the ECLK pin. The

usage of the bits is shown in Table 23-17. Divider is always disabled in emulation modes and active as

programmed in all other operating modes.

Table 23-17. Free-Running ECLK Clock Rate

EDIV[1:0]

Rate of Free-Running ECLK

ECLK = Bus clock rate

ECLK = Bus clock rate divided by 2

ECLK = Bus clock rate divided by 3

ECLK = Bus clock rate divided by 4

76543210

IRQE

IRQEN

000000

Reset

01000000

= Unimplemented or Reserved

Figure 23-16. IRQ Control Register (IRQCR)

Table 23-18. IRQCR Field Descriptions

Field

Description

IRQE

IRQ Select Edge Sensitive Only

Special modes: Read or write anytime.

Normal and emulation modes: Read anytime, write once.

0 IRQ conﬁgured for low level recognition.

1 IRQ conﬁgured to respond only to falling edges. Falling edges on the IRQ pin will be detected anytime

IRQE = 1 and will be cleared only upon a reset or the servicing of the IRQ interrupt.

IRQEN

External IRQ Enable

Read or write anytime.

0 External IRQ pin is disconnected from interrupt logic.

1 External IRQ pin is connected to interrupt logic.

Table 23-16. ECLKCTL Field Descriptions (continued)

Field

Description

PC912XDP512F0CFVR bảng dữ liệu(PDF) 927 Page - Freescale Semiconductor, Inc

PC912XDP512F0CFVR bảng dữ liệu(HTML) 927 Page - Freescale Semiconductor, Inc

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 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL