tmp88cs43fg TOSHIBA Semiconductor CORPORATION, tmp88cs43fg Datasheet - Page 61

• Manufacturer Part Number: tmp88cs43fg
• Description: 8 Bit Microcontroller Tlcs-870/x Series
• Manufacturer: TOSHIBA Semiconductor CORPORATION

5.7 Port P6 (P67 to P60)
and output modes using the P6 port input/output control register (P6CR), P6 port output latch (P6DR), and ADC-
CRA<AINDS>. When reset, the P6CR Register and the P6DR output latch are initialized to 0 while ADC-
CRA<AINDS> is set to 1, so that P67 to P60 have their inputs fixed low (= 0). When using the P6 port as an input
port, set the corresponding bits for input mode (P6CR = 0, P6DR = 1). The reason why the output latch = 1 is
because it is necessary to prevent current from flowing into the shared data input circuit. When using the port as an
output port, set the P6CR Register's corresponding bits to 1. When using the port for analog input, set the corre-
sponding bits for analog input (P6CR = 0, P6DR = 0). Then set ADCCRA<AINDS> = 0, and AD conversion will
start.
AD conversion are selected using ADCCRA<SAIN>.
instructions on these ports during AD conversion. This is necessary to maintain the accuracy of AD conversion.
Also, do not apply rapidly changing signals to ports adjacent to analog input during AD conversion.
ata output (P6)
Port P6 is an 8-bit input/output port shared with AD converter analog input. This port is switched between input
The ports used for analog input must have their output latches set to 0 beforehand. The actual input channels for
Although the bits of P6 port not used for analog input can be used as input/output ports, do not execute output
If an input instruction is executed while the P6DR output latch is cleared to 0, data “0” is read in from said bits.
ata input (P6)
Analog input
P6CRi input
AIN S
P6CRi
STOP
SAIN
Q
Q
Figure 5-8 Port P6
Page 51
Note 1: i = 7
Note 2: STOP exists in SYSCR1 register bit 7.
Note 3: SAIN selects A input channels.
P6i
to
0
TMP88CS43FG