Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Uživatelský manuál stáhnout pdf (Strana 67)

The following peripheral registers are used to control the LCD controller.

Bit 0: (LCFG.0) Display Enable (DPE). When the LCD controller is in normal operating mode, this bit controls whether the display reg-

ister data is used to drive the LCD. This bit has no meaning when LCD operation is suspended (OPM = 0).

0 = Disables the LCD display. SEG and COM waveforms are driven to turn all segments OFF.

1 = Drive the LCD display normally.

Bit 1: (LCFG.1) Operation Mode (OPM). This bit determines whether the LCD controller is operating (driving SEG and COM lines) or

suspended (with its clock gated off).

0 = The LCD controller is suspended.

1 = The LCD controller is in normal operating mode.

Bits 2 and 3: (LCFG.2 and LCFG.3) Reserved

Bits 4 to 7: (LCFG.4 to LCFG.7) Segment Pin Configuration (PCF0 to PCF3). Each of these bits controls whether a group of pins

operates as port pin I/O or as LCD segment outputs. The specific pins controlled by each bit depend on the package type, as shown

in Table 28 and Table 29.

MAXQ Family User’s Guide:

MAXQ2000 Supplement

Bit # 7 6 5 43210

Name PCF3 PCF2 PCF1 PCF0 — — OPM DPE

Reset 0 0 0 00000

Access r/w r/w r/w r/w r/w r/w r/w r/w

BIT PINS AFFECTED FUNCTION WHEN PCFn = 0 FUNCTION WHEN PCFn = 1

PCF0 58 to 65 P0.0 to P0.7 SEG0 to SEG7

PCF1 66 to 68, 1 to 5 P1.0 to P1.7 SEG8 to SEG15

PCF2 6 to 13 P2.0 to P2.7 SEG16 to SEG23

PCF3 14 to 21 P3.0 to P3.7 SEG24 to SEG31

Table 28. PCFn Bit Functions for 68-Pin Package

BIT PINS AFFECTED FUNCTION WHEN PCFn = 0 FUNCTION WHEN PCFn = 1

PCF0 49 to 56 P0.0 to P0.7 SEG0 to SEG7

PCF1 1 to 8 P1.0 to P1.7 SEG8 to SEG15

PCF2 9 to 12 P2.4 to P2.7 SEG16 to SEG19

PCF3 13 to 16 P3.4 to P3.7 SEG20 to SEG27

Table 29. PCFn Bit Functions for 56-Pin Package

Maxim Integrated

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 92 93

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Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Uživatelský manuál Strana 67