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| 型号： | P87C766CBA |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | Microcontrollers for PAL/SECAM TV with OSD and VST |
| 中文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PQCC68 |
| 封装： | PLASTIC, MO-047AC, SOT-188-2, LCC-68 |
| 文件页数： | 34/92页 |
| 文件大小： | 382K |
| 代理商： | P87C766CBA |
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1999 Mar 10
34
Philips Semiconductors
Product specification
Microcontrollers for PAL/SECAM TV
with OSD and VST
P8xCx66 family
14 PIN FUNCTION SELECTION
Ports 1, 3 and 5 are dual purpose ports and can be
configured as general I/O port lines or selected as
alternative functions. Selection of the pin function as an
alternative function is achieved by setting the associated
port latch bit to a logic 1 and then enabling the alternative
function using its associated SFR.
14.1
Port 1 pin function selection
Port 1 is an 8-bit port which can be configured as eight
bidirectional port lines (P1.0 to P1.7) or as two external
interrupts (INT0 and INT1), two timer/counter inputs
(T0 and T1) and the I
2
C-bus lines (SDA and SCL).
P1.0 and P1.7 have no alternative functions.
To configure these pins as alternative functions the
corresponding bit in the Port 1 Latch (P1) should be
programmed to a logic 1. The I
2
C-bus lines are enabled by
setting the I
2
CE bit in the I
2
C-bus Port Control Register,
see Section 10.8. The remaining alternative functions are
enabled using the associated SFR.
To use Port 1 pins as general I/O lines the alternative
functions must be disabled.
14.2
Port 5 and P3.3 pin function selection
Port 5 pins can be selected as eight bidirectional port lines
(P5.0 to P5.7) or as seven 7-bit PWM outputs
(PWM0 to PWM6) and one 14-bit PWM output (TPWM).
Each 7-bit PWM output can be selected by setting the
PWMnE bit in its associated PWMn register, to a logic 1
(see Section 15.1). When the PWMnE bit is a logic 0 the
port line function is selected. The 14-bit PWM output
(TPWM) is selected by setting the TPWME bit in SFR
TDACH to a logic 1 (see Section 15.2).
P3.3 can also be selected as a bidirectional port line (P3.3)
or as a 7-bit PWM output (PWM7). The 7-bit PWM output
is enabled by setting the PWME7 bit in SFR PWM7 to a
logic 1 (see Section 15.1).
14.3
Port 3 pin function selection
Port 3 is a 4-bit port which can be configured as four
bidirectional port lines (P3.0 to P3.3) or as 3 ADC inputs
(ADC0 to ADC2) and one 7-bit PWM output (PWM7).
The selection of the PWM7 output is discussed in
Section 14.2.
To select the alternative function of these port lines the
corresponding bit in the Port 3 Latch (P3) should be
programmed to a logic 1. The ADC inputs are then
enabled using the SFR SAD2 as described in
Section 14.3.1.
To use Port 3 pins as general I/O lines the alternative
functions must be disabled.
14.3.1
ADC C
ONTROL
R
EGISTER
2 (SAD2)
Table 36
ADC Control Register 2 (SFR address CAH)
Table 37
Description of SAD2 bits
7
6
5
4
3
2
1
0
ADCE2
ADCE1
ADCE0
BIT
SYMBOL
ADCE2
DESCRIPTION
7 to 3
2
These 5 bits are not used.
ADC2 input select.
If ADC2 = 1, the ADC2 input is selected. If ADC2 = 0, the
open-drain bidirectional port line P3.2 is selected.
ADC1 input select.
If ADC1 = 1, the ADC1 input is selected. If ADC2 = 0, the
open-drain bidirectional port line P3.1 is selected.
ADC0 input select.
If ADC0 = 1, the ADC0 input is selected. If ADC0 = 0, the
open-drain bidirectional port line P3.0 is selected.
1
ADCE1
0
ADCE0
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