MAC7200 datasheet(381/976 Pages) FREESCALE

381 / 976 page

Memory Map/Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

303

14.8.1.8

Saved Level Mask (SLMASK) Register

The Saved Level Mask Register is provided so the INTC can automatically manage masking of interrupt

requests based on the programmed priority level. If enabled by ICONFIG[EMASK] being set, an interrupt

acknowledge read cycle returns a vector number identifying the physical request source, and the

CLMASK register is loaded with the level number associated with the request and the current contents of

the CLMASK register is loaded into the SLMASK register. Typically, once a level-n interrupt request is

handled, the service routine restores the saved level mask value into the current level mask register to

re-enable the lower priority requests.

See Figure 14-9 and Figure 14-14 for the SLMASK definition.

Table 14-13. Current Level Mask (CLMASK) Field Descriptions

Name

Description

4–0

CLMASK

Current Level Mask

This 5-bit field is treated as a signed integer within the range [-1, 0, 1,..., 15]. The value defines the level mask,

where only interrupt levels greater than the current value are processed by the controller.

if 0x1f, then level 00 - 15 requests are processed

if 0x00, then level 01 - 15 requests are processed

if 0x01, then level 02 - 15 requests are processed

if 0x02, then level 03 - 15 requests are processed

if 0x03, then level 04 - 15 requests are processed

if 0x04, then level 05 - 15 requests are processed

if 0x05, then level 06 - 15 requests are processed

if 0x06, then level 07 - 15 requests are processed

if 0x07, then level 08 - 15 requests are processed

if 0x08, then level 09 - 15 requests are processed

if 0x09, then level 10 - 15 requests are processed

if 0x0a, then level 11 - 15 requests are processed

if 0x0b, then level 12 - 15 requests are processed

if 0x0c, then level 13 - 15 requests are processed

if 0x0d, then level 14 - 15 requests are processed

if 0x0e, then level

15 requests are processed

if 0x0f - 0x1e,

then all requests are masked

76543210

SLMASK[4:0]

RESET:

11111

= Unimplemented or Reserved

Figure 14-9. Saved Level Mask (SLMASK) Register

MAC7200 Datasheet(PDF) 381 Page - Freescale Semiconductor, Inc

MAC7200 Datasheet(HTML) 381 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

Datasheet Download

Link URL