AS87C196CB20F8 datasheet(13/38 Pages) INTEL

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87C196KR, JV, JT, JR, CA Microcontrollers

Datasheet

P5.5/BHE#/WRH#

Byte High Enable or Write High output, as selected by the CCR. BHE# = 0 selects

the bank of memory that is connected to the high byte of the data bus. A0 = 0

selects that bank of memory that is connected to the low byte. Thus accesses to a

16-bit wide memory can be to the low byte only (A0 = 0, BHE# =1), to the high byte

only (A0 = 1, BHE# = 0) or both bytes (A0 = 0, BHE# = 0). If the WRH# function is

selected, the pin will go low if the bus cycle is writing to an odd memory location.

BHE#/WRH# is only valid during 16-bit external memory write cycles. Also an

LSIO pin when not BHE#/WRH#.

P5.6/READY

Ready input to lengthen external memory cycles, for interfacing with slow or

dynamic memory, or for bus sharing. If the pin is high, CPU operation continues in

a normal manner. If the pin is low prior to the falling edge of CLKOUT, the memory

controller goes into a wait state mode until the next positive transition in CLKOUT

occurs with READY high. When external memory is not used, READY has no

effect. The max number of wait states inserted into the bus cycle is controlled by

the CCR/CCR1. Also an LSIO pin when READY is not selected.

P5.4/SLPINT

Dual functional I/O pin. As a bidirectional port pin (LSIO) or as a system function.

The system function is a Slave Port Interrupt Output Pin.

P6.2/T1CLK

Dual function I/O pin. Primary function is that of a bidirectional I/O pin (LSIO);

however it may also be used as a TIMER1 Clock input. The TIMER1 will increment

or decrement on both positive and negative edges of this pin.

P6.3/T1DIR

Dual function I/O pin. Primary function is that of a bidirectional I/O pin (LSIO);

however it may also be used as a TIMER1 Direction input. The TIMER1 will

increment when this pin is high and decrements when this pin is low.

PORT1/EPA0–7

P6.0–6.1/EPA8–9

Dual function I/O port pins. Primary function is that of bidirectional I/O (LSIO).

System function is that of High Speed capture and compare. EPA0 and EPA2

have yet another function of T2CLK and T2DIR of the TIMER2 timer/counter.

PORT 0/ACH0–7

8-bit high impedance input-only port. These pins can be used as digital inputs and/

or as analog inputs to the on-chip A/D converter. These pins are also used as

inputs to EPROM parts to select the Programming Mode.

P6.4–6.7/SSIO

Dual function I/O ports that have a system function as Synchronous Serial I/O.

Two pins are clocks and two pins are data, providing full duplex capability.

PORT 2

8-bit multi-functional port. All of its pins are shared with other functions.

PORT 3 and 4

8-bit bidirectional I/O ports with open drain outputs. These pins are shared with the

multiplexed address/data bus which has strong internal pullups.

TXCAN

Push-pull output to the CAN bus line.

RXCAN

High-impedance input-only from the CAN bus line.

Table 2.

Pin Descriptions (Sheet 2 of 2)

Symbol

Name and Function

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